Intestinal Stomas

No dedicated page existed for this topic before this ingest, despite stomas being one of the most frequently performed elements of colorectal surgery. Content below is from a textbook reference chapter (ASCRS Ch54 - Intestinal Stomas), not primary literature.

Stomas are temporary or permanent means of fecal diversion for a variety of GI, neurologic, and genitourinary conditions. An estimated 120,000 stomas are created annually in North America (dated estimate), with an estimated prevalence of 450,000–800,000 ostomates. Stomas are classified as end or loop configuration, and by the exteriorized bowel segment (colostomy, ileostomy, jejunostomy).

Configuration and indications

Colostomy

End colostomy: indicated for permanent or temporary fecal drainage in low rectal cancer, recurrent anal cancer, severe anorectal Crohn's disease, severe radiation proctitis (see Radiation Colitis (Proctitis)), emergent sigmoid diverticulitis (Hartmann's procedure — see Diverticulitis), and trauma-related damage control. Also preferred for patients unsuited to restorative procedures: fecal incontinence, severe neurologic impairment, the elderly, prohibitive comorbidities, or prior sphincter-complex resection.

Loop colostomy: diverts fecal flow proximal to a tenuous anastomosis or problematic distal bowel. Typically fashioned from the redundant, non-peritonealized sigmoid or transverse colon. Dual-lumen configuration allows proximal diversion with retrograde venting of the distal segment — useful for palliative diversion of obstructing distal lesions, temporary protection of a colorectal/ coloanal anastomosis, staged repair of pelvic sepsis/rectal trauma/nonhealing sacral decubitus ulcers/fistulizing disease, and (rarely) exteriorization of an iatrogenic/traumatic colon perforation using the injury itself as the stoma orifice. Transverse loop colostomy is technically simple but often poorly tolerated (large size, cephalad location, frequent complications) — a loop ileostomy usually provides better outcomes when either is feasible.

Small bowel stomas (ileostomy, jejunostomy)

Permanent end ileostomy: most commonly follows total proctocolectomy for Crohn's disease (see Crohn Disease) or in UC/FAP/Lynch patients who are poor restorative-procedure candidates. Temporary end ileostomy: follows total abdominal colectomy for UC in a staged IPAA (see Ileal Pouch-Anal Anastomosis (IPAA)). Jejunostomy: reserved for patients with no remaining ileum after repetitive Crohn's resections. Loop ileostomy: favored for temporary diversion given small bowel caliber, robust vascularity, and distance from the distal colon/rectum — though liquid output can cause pouching problems, dehydration, electrolyte imbalance, and renal failure.

Physiology

Colostomy: the colon receives 1500–2000 mL of liquid stool from the small bowel daily, reabsorbs ~90% of the water (1350 mL, mostly in the right colon), and excretes 100–150 mL with solid waste. Distal (sigmoid/left) colostomies produce more solid stool than proximal (transverse/ascending) stomas; transverse colostomies behave more like small bowel stomas with respect to fluid/electrolyte imbalance risk. Colonic transit time varies 24–150 hours, so distal colostomies function periodically (enabling colostomy irrigation techniques for some patients), while proximal colostomies with liquid stool function more continuously and are not well suited to irrigation.

Small bowel stomas: since these obviate colonic sodium/water reabsorption, they carry a higher risk of fluid/electrolyte imbalance. Small bowel length ranges 275–850 cm (mean ~500 cm in situ) and receives 9–10 L of fluid daily from proximal GI sources; the majority of nutritional absorption occurs in the first 150 cm (~6 L reabsorbed in jejunum, only 2.5 L in ileum). Normal ileostomy outputs range 200–1200 mL/day (composition detailed in the chapter's Table 54.1: ~500 g wet weight, 92% water, sodium 100–130 mEq/L). Proximal stomas (e.g. jejunostomy) bypass more absorptive surface area and risk greater nutritional/electrolyte/fluid imbalance. Fat-soluble nutrient absorption occurs in the terminal ileum, so proximal diversion >100 cm from the ileocecal valve can cause steatorrhea and vitamin B12 deficiency. Even a new terminal end ileostomy preserving total small bowel length can transiently run high outputs from loss of the ileocecal valve/colon.

Preoperative considerations

Stoma site marking: recommended by ASCRS and the Wound, Ostomy, and Continence Nurses Society (WOCN) for every planned stoma. Decreases postoperative complications and improves stoma-specific and overall quality of life, patient confidence, independence, and stoma-care costs. The "stoma triangle" (bounded by the anterior superior iliac spine, pubic tubercle, and umbilicus) or the intersection of the infraumbilical fat-pad summit and the rectus sheath are used to identify a preliminary site, centered within the rectus sheath (theorized, though contested in the literature, to reduce parastomal herniation). The site should have a 2-inch perimeter of clear, intact skin; avoid scars, folds, creases, the umbilicus, costal margin, ASIS, and pubic symphysis; and be reassessed with the patient sitting (folds not apparent supine) and standing (waistline, breasts, hernias). Marked with indelible marker or India ink tattoo; multiple candidate sites can be ranked in case of intraoperative findings requiring a change. Two stomas (e.g. pelvic exenteration) should be sited on opposite sides/levels to avoid stoma-belt interference.

Preoperative stoma education: societal guidelines recommend preoperative education by a WOCN-certified nurse, since pain/medications/psychological stress diminish the effectiveness of purely postoperative teaching. Chaudhri's study of two 45-minute preoperative sessions found decreased time to postop stoma proficiency (9→5.5 days), decreased length of stay (10→8 days), and $2,104/patient net cost savings. Younis found preoperative education decreased length of stay from 14 to 8 days. The ACS Ostomy Home Skills Kit (developed with ASCRS; >134,000 kits distributed since 2010) is a standardized instructional resource.

Technical creation

Small bowel end stoma: mesentery is mobilized to allow tension-free reach (some mesenteric vessel division may be needed, particularly in thick abdominal walls — perfusion of the stoma tip should then be confirmed by palpable pulses, pulsatile bleeding from the cut mesenteric edge, or ICG fluorescence). A cylindrical trephine is created at the marked site (open: through skin disk, subcutaneous tissue, rectus sheath/muscle split; laparoscopic: similar principles with a plastic sleeve wound retractor to aid visualization once pneumoperitoneum is lost). 5–6 cm of bowel and mesentery should be pulled through to avoid retraction; the finished stoma should protrude 2–3 cm (heights <2 cm associate with more complications). "Brooke" sutures secure the everted bowel to the skin — a randomized study found full-thickness (dermal+epidermal) fixation modestly reduced peristomal excoriation (52%→41%) vs. intradermal-only fixation, without a difference in stoma-specific quality of life or other complications.

Small bowel loop stoma: a Penrose drain/umbilical tape is passed through a mesenteric defect to deliver the loop through a slightly larger trephine (accommodates two fingers); marking sutures or an anti-mesenteric arrow orient the limbs to prevent twisting/maturing the wrong limb. The drain may be exchanged for a supporting stoma rod — a 2019 meta-analysis of five studies found rods did not alter retraction rates and were associated with increased necrosis and peristomal dermatitis, so the chapter advocates conditional (not routine) rod use pending more conclusive data. The distal limb is incised near-circumferentially (mesenteric wall left intact) and the "hood" everted and sutured, producing a spout with the proximal limb protruding 2–3 cm.

End colostomy: tenuous colonic blood supply requires special care — full mobilization (e.g. of the splenic flexure with high vascular ligation for a proximal end descending colostomy in an obese patient) to ensure tension-free reach; treat the colonic conduit "like an anastomosis." Perfusion assessment is critical since visible ischemic changes can lag hours to days behind actual injury. Simple assessment: palpable mesenteric pulses or pulsatile bleeding from the cut mesenteric edge. ICG (indocyanine green) near-infrared fluorescence is increasingly used — well-perfused tissue fluoresces, non-perfused tissue does not; any non-perfused segment is excised and the stoma recreated. Venous congestion can make a stoma appear dusky despite adequate ICG fluorescence, indicating a too-tight trephine (enlarging it improves perfusion); congestion can persist days with occasional self-limited mucosal sloughing. The colostomy is matured to protrude 1–2 cm (less eversion needed than ileostomy since solid colostomy effluent is not as caustic to skin).

Loop colostomy: typically from non-peritonealized sigmoid or transverse colon, matured by incising along the bowel's long axis and suturing the cut edge to the skin circumferentially — can be quite large depending on caliber/mesenteric thickness/edema.

Postoperative care

Early inpatient: the stoma swells 2–3× original size, normalizing over 4–6 weeks. Stoma rods (if used) are removed at 3–5 days once tension decreases. Function does not begin immediately — initial "bowel sweat" (serosanguinous/mildly bilious thin fluid) precedes normal output; colostomies produce gas, then liquid, then solid stool over time, while small bowel stomas function sooner and can produce significant dark green bilious output even fasting. >30% of new ileostomy patients experience dehydration, with early readmission rates >15% — perioperative stoma-care pathways (education, standardized discharge criteria, output logs, visiting-nurse care, early follow-up) reduce dehydration-related readmissions. ACS unpublished data: only 53% of homegoing new ostomates could apply a new pouch and only 28% could fix pouch leaks at discharge — 45% worried about self-care, 40% felt sad/depressed, 62% were uncomfortable leaving home, underscoring the value of continued outpatient/home-nursing support.

Appliances: adhesive flange (wafer, pectin-like adhesive) plus a one- or two-piece collection bag. Two-piece systems allow bag detachment without removing the flange (useful for early daily inspection). The wafer should be trimmed to the exact stoma size to minimize skin exposure to effluent; average flange life is 3–7 days (more frequent changes suggest technique/appliance/skin/ construction problems). Specialized options: convex wafers (flush/retracted stomas), stoma belts (leak-prone stomas), stoma paste/barrier rings (uneven peristomal contours), venting/charcoal-filter bags (gas), high-output leg-bag systems.

Stoma complications

NSQIP data: 37% unadjusted complication rate for elective stoma cases, 55% for emergency cases — patient-reported rates run even higher. Reported incidence ranges (Table 54.2): retraction 0–22%, parastomal hernia 0–40% (see Parastomal Hernia Repair for full incidence-by-stoma-type, risk-factor, and repair-technique detail), stoma prolapse 0–10%, stoma necrosis 0–7%, peristomal skin problems 10–42%, total complications 12–72%.

Ischemia: necrosis, retraction, stenosis

Arterial insufficiency is the most common necrosis cause (venous ischemia rarely from fascial trephine compression). Loop stomas (preserved bidirectional mesenteric flow) are more resistant than end stomas (unidirectional flow after mesenteric division). Ischemia progresses mucosal pallor→petechiae→cyanosis→purple-black necrosis; the distal-most everted edge is most vulnerable. A bedside "test tube" exam (lubricated clear glass tube plus flashlight down the stomal lumen) assesses the proximal extent of mucosal ischemia. Management differs by depth: any subfascial ischemia should be revised (risk of progression to intraperitoneal necrosis/perforation); a supra-fascial colostomy that appears viable can be observed (low perforation risk, and solid output can still be pouched even if the stoma becomes flush); a partially viable permanent end ileostomy with muscularis ischemia should be revised promptly (distal necrosis → difficult-to-pouch flush stoma). Chronic mild ischemia causes late stenosis/retraction — asymptomatic mild cases can be observed if sealing/skin remain adequate; symptomatic skin-level colostomy stenosis can be revised locally, while subfascial stenosis may need an intra-abdominal approach.

Peristomal skin disorders

The most common complication overall — up to 70% of new ostomates have peristomal dermatitis, often unrecognized by the patient (one survey: >60% of new ostomates had irritation, nearly half unrecognized by patients themselves; treatment improved stoma-specific quality of life). Most irritation arises from poorly fitted/sized appliances exposing skin to caustic effluent — a self-perpetuating leakage→excoriation→worse-adhesion→more-leakage cycle. Management: precise flange sizing/trimming, convex systems or stoma belts for flush/poorly-sealing stomas, protective skin barrier wipes, topical stoma powder for weeping excoriation, stoma paste/barrier rings for contour irregularities. Fungal infection (Candida albicans most common): reddened shiny patches with satellite papules at the flange interface — treated with topical antifungal powder (nystatin) at each appliance change (typically resolves in 1–2 weeks); resistant cases may need topical miconazole/clotrimazole or oral antifungals. Obese ileostomy patients are at particularly high risk given liquid effluent plus stoma-construction challenges in thick abdominal walls.

Peristomal pyoderma gangrenosum (PPG)

A rare inflammatory skin disease (painful ulcers, well-defined erythematous/violaceous undermined borders) affecting an estimated 0.5–5% of IBD patients (see Inflammatory Bowel Disease) and ~0.6% of ostomates overall (possibly underdiagnosed). Half of PPG patients have associated rheumatoid arthritis, paraproteinemia, or hematologic malignancy; 25–50% is idiopathic. Associated with female sex, autoimmune disorders, and obesity in IBD patients; nearly 70% of presentations coincide with a flare of underlying systemic disease (2019 meta-analysis), though ~20% of PPG patients have no IBD at all. Thought to arise from pathergy triggered by local skin trauma at the appliance interface. Diagnosis is clinical (firm pink/purple hemorrhagic nodule → rapidly enlarging painful, occasionally purulent ulcer with a raised border, sometimes with epidermal bridging) — biopsy mainly excludes malignancy/infection rather than confirming PPG, given no pathognomonic histology. No standard treatment algorithm exists. Multidisciplinary management addresses the causative underlying disorder alongside aggressive wound/stoma care: topical, intralesional, and systemic steroids; immunomodulators; antibiotics; and stepwise escalation to biologics. One series: combined intralesional steroids + gentle debridement completely healed 40% and partially healed another 40% — though some question whether intralesional injection worsens pathergy, favoring topical tacrolimus/ steroids (reported ~60% healing). >50% of one medically-treated cohort ultimately required stoma resiting for control; resiting does not guarantee against recurrence. One series reported complete healing after surgical resection of separate, actively-diseased non-stomal IBD bowel.

Peristomal varices

Portosystemic venous shunts between the stoma and abdominal wall in chronic portal hypertension — identified as a circumferential blue/purple subcutaneous ring at the mucocutaneous junction, with a "raspberry" stoma appearance, dilated submucosal veins, peristomal caput medusa, and easily bleeding hyperkeratotic skin. Most commonly seen with IBD + primary sclerosing cholangitis (PSC), also alcoholic cirrhosis and hepatic metastatic burden. Incidence 27–50% of ostomates with portal hypertension; ~40% of those with varices will bleed and need transfusion (mean time to first hemorrhage: 70 months post-stoma). Management: first local measures (digital pressure, epinephrine-soaked gauze, suture ligation — not durable but can temporize); ~85% rebleed after local nonoperative management. TIPS (transjugular intrahepatic portosystemic shunt) is ~5× more effective than local measures, curing bleeding in ~80% of patients; liver transplant may be appropriate depending on etiology. Other options: injection sclerotherapy, systemic octreotide, percutaneous embolization. Surgical mucocutaneous disconnection (cylindrical dissection to the fascia with variceal ligation and re-maturation) is reserved for local-therapy failure when portal decompression isn't possible — a potentially bloody procedure with recurrence over time but repeatable. For PSC-associated UC, peristomal variceal hemorrhage can occur in up to 53% of patients within 4 years of end ileostomy — IPAA is generally preferred to avoid a permanent stoma and its variceal risk (can be performed safely after TIPS or liver transplant), though PSC-associated pouchitis develops in >50% of PSC patients within 4 years of pouch creation regardless.

Stoma prolapse

Bowel proximal to an end stoma (or either limb of a loop stoma) intussuscepts through the matured stoma. Categorized fixed vs. sliding (the problematic mobile variant, seen in up to 8% of end and 47% of loop stomas). Arises from mobile mesentery, increased intra-abdominal pressure, an enlarged trephine, or fixation failure. Minimally symptomatic: reassurance, appliance modification, external fixation devices. Significantly symptomatic: surgical revision via local parastomal or open abdominal approaches — no single technique is clearly superior. Local procedures are typically tried first, reserving intra-abdominal approaches (which better address a concomitant parastomal hernia) for recurrent/complicated cases. Options include local amputation with reanastomosis, excision with de novo stoma creation, prolapse reduction/fixation (± seromyotomy to promote serosa-to-serosa bonding), a subcutaneous mesh cerclage strip (one 10-patient series: no recurrence at 25-month median follow-up), retroperitoneal tunneling with prestomal mesentery pexy, or converting a prolapsing loop colostomy to an end/loop-end configuration. Incarcerated (but viable) prolapse can be attempted reduction with sedation/analgesics; ice and table sugar have been reported to decrease prolapse edema and ease reduction. Strangulated prolapse mandates immediate surgery. Pregnancy-related "pseudoprolapse" (typically <3 cm, from uterine displacement of viscera) resolves after delivery and rarely needs revision.

Peristomal abscess

Early postoperative abscesses reflect intraoperative contamination; late abscesses suggest penetrating Crohn's disease of the stoma or an intra-abdominal source. Drainage (image-guided or operative) should be sited remote from the appliance interface or directly through the mucocutaneous junction to avoid pouching problems; suspected fistulization after drainage warrants endoscopic or radiographic evaluation.

High output small bowel stomas

Normal ileostomy output: 800–1200 mL/day; >1200–2000 mL/day is considered high. Most common in new ostomates as ileus resolves (roughly half resolve spontaneously within 2 weeks) or as a persistent problem proportional to remaining proximal bowel length. Outputs <1200 mL/day are usually well tolerated; 1200–1500 mL/day is borderline. Management ladder (Fig. 54.21 algorithm): dietary/behavioral changes first (small frequent meals, separating liquids/solids, avoiding concentrated sweets, naturally-thickening foods like bread/crackers/peanut butter/bananas, psyllium powder, hypotonic oral fluid restriction to 500–1000 mL/day plus WHO oral rehydration solution — most patients can avoid IV supplementation on this regimen alone) → antimotility agents (loperamide, then diphenoxylate/atropine, taken ~30 min before meals; elixir forms if transit is too fast for tablets to dissolve) → antisecretory therapy (H2 blockers/PPIs) → opium tincture or codeine phosphate as a later measure for recalcitrant cases. Persistently high outputs merit workup: cross-sectional/fluoroscopic imaging to exclude partial obstruction (which paradoxically causes high output), evaluation for small bowel Crohn's disease, stool testing for C. difficile (a reported cause of high-output states in both small and large bowel stomas — see Infectious Colitis), cholestyramine for steatorrhea from ileal resection, and pancreatic enzyme replacement for pancreatic insufficiency. Severe/refractory cases (especially proximal jejunostomy in short-gut situations — see Short Bowel Syndrome) may need parenteral fluids/nutrition; octreotide, teduglutide, and growth hormone show promise for the most recalcitrant short-gut-related high-output stomas.

Stoma reversal

Preoperative preparation

Record review (operative/pathology reports) is important when reversing another surgeon's stoma. For a diverting loop protecting a distal anastomosis, the chapter's authors prefer a lower GI fluoroscopic contrast study to exclude leak/stricture/obstruction, though several groups favor selective (not routine) imaging, noting most anastomotic complications can be diagnosed without it. Endoscopic evaluation may be needed to exclude cancer recurrence, confirm IBD disease control before reversal (aware that diversion colitis can mimic IBD grossly/histologically), or dilate a coloanal/ IPAA anastomosis.

Timing

Loop stomas: typically reversed 2–3 months after creation. Some evidence has suggested loop ileostomy reversal <8.5 weeks post-coloanal/ileoanal anastomosis carries higher complication risk, but this has been challenged — a Scandinavian RCT found reversal at 8–13 postoperative days as safe as reversal at 12 weeks after LAR in selected patients without imaging/endoscopic leak evidence, with fewer complications (mostly stoma-related) in the early-closure group and no health-related-quality-of-life difference at 3/6/12 months — though nearly 70% of screened patients were ineligible (13% suspected leak, 38% medical reasons, 13% unwilling), limiting generalizability. The chapter's authors default to 8–12 weeks pending more universal evidence, while acknowledging early closure can be considered in highly selected, motivated, thoroughly-evaluated patients. Adjuvant chemotherapy adds complexity: conventional wisdom keeps a diverting stoma through treatment to avoid reversal complications during chemo, though chemotherapy itself can compound dehydration (readmission in up to 11% of ileostomy patients) — a small retrospective study/meta-analysis found reversal during chemotherapy had comparable morbidity/cancer outcomes to post-chemotherapy reversal, though this practice is not widely adopted.

End stomas: timing remains contentious. Retrospective comparisons of early (<15 weeks) vs. late (>15 weeks) end colostomy reversal found similar morbidity but increased length of stay, adhesion density, and small bowel injury favoring later surgery; an older study linked early Hartmann's reversal (<3 months) to more leaks/sepsis/death vs. reversal after 6 months. The balance of low-level evidence favors delaying end stoma reversal 3–6 months, though some small series show no timing-dependent outcome difference.

Technique — loop stoma reversal

Performed as a local peristomal circular-incision procedure once the distal anastomosis/pathology is satisfactory (with the full midline prepped in case unplanned laparotomy is needed). Circumferential dissection proceeds to the anterior rectus sheath, then limited intra-abdominal adhesiolysis frees the bowel loop for anastomosis/fascial closure (care to avoid marginal artery injury during loop colostomy reversal, given the risk of distal colonic ischemia). Bowel integrity can be checked with a pressurized dilute-povidone-iodine leak test. Stapled side-to-side (functional end-to-end) closure via a GIA-type stapler is compared against handsewn closure: multiple meta-analyses and three single-center RCTs show equivalent leak/wound-infection/overall-complication/cost outcomes, but stapled closure is faster, causes less postoperative obstruction, and shortens hospital stay (theorized from the wider lumen vs. the narrower handsewn lumen's edema-prone obstruction risk); a large multicenter trial (HASTA) found similar obstruction rates between the two. ASCRS Clinical Practice Guidelines state both stapled and hand-sutured techniques are acceptable for loop ileostomy closure. Wound closure at the former stoma site: purse-string skin closure shows significantly lower wound infection rates and improved patient satisfaction vs. traditional linear closure, and is recommended by ASCRS CPG when feasible.

Technique — end stoma reversal

A substantially bigger undertaking than loop reversal — potentially larger than the index operation. Ureteral stents may be used selectively to aid identification in a hostile field; pelvic retractors, proctoscopes, EEA sizers, and vaginal retractors should be available. Open or laparoscopic/robotic approaches follow the same principles: circumferential dissection of the stoma back into the abdomen, adhesiolysis, mobilization/preparation of distal and proximal conduits (rectal-stump scarring may rarely require resection of the previous closure line — anastomosis should go to the rectum, not a retained sigmoid stump), and assessment/remediation of the adequacy of the original oncologic or diverticular resection at the time of reversal. Stapled end-to-end anastomosis (EEA) is common for colorectal reconstruction after Hartmann's — if the stapler cannot reach the rectal stump (corrugated, contracted, entrapped, or lost in a hostile pelvis), an end-to- side anastomosis to the anterior rectal wall is an alternative, kept several centimeters from the proximal rectal margin to avoid ischemia to the remaining rectal-wall bridge (with full mobilization of vagina/bladder away from the anastomotic site to avoid iatrogenic fistula). An air-leak test should follow; a positive test may prompt resection/recreation, revision, or protection with a diverting loop ileostomy.

Complications of stoma reversal

Loop stoma reversal is generally well tolerated (low leak risk) but wound infections and late incisional hernia are more common than often acknowledged. End stoma reversal carries substantially higher morbidity. Reported ranges (Table 54.5): superficial SSI 3–13.5% (loop ileostomy) to 14–43.8% (end colostomy reversal with colorectal anastomosis); deep space infection/leak 1.5–21%; bowel obstruction/ileus 4–23%; clinically diagnosed hernia 0–50%.

Loop ileostomy vs. loop transverse colostomy for temporary diversion

Similar overall complication rates but different profiles: loop ileostomies are more prone to dehydration, readmission, and post-reversal obstruction, but have less post-closure sepsis and fewer pre-/postoperative hernias, and may offer better quality of life. ASCRS CPG recommends loop ileostomy preferentially over transverse loop colostomy for temporary fecal diversion in most cases, while acknowledging particular circumstances favoring transverse colostomy — e.g. a distal colorectal obstruction (afferent diversion + efferent retrograde venting) or the technically easier construction in obese patients.

Special considerations

The difficult stoma

Obesity increases stoma-related complication risk, ironically making the patients who most need a good stoma the hardest to construct one for. Techniques: favoring the supraumbilical abdominal wall (often thinner than infraumbilical in obese patients) or a subxiphoid loop transverse colostomy in the super-morbidly obese; stepwise delivery of thick bowel through the trephine layer-by-layer; plastic sleeve wound retractors with lubricant; cautious subcutaneous lipectomy (risks a recessed, hard-to-pouch stoma if overdone). The loop-end stoma configuration (Fig. 54.28/54.29) preserves mesentery to the entire stoma while gaining extra reach when the true stoma tip is mesentery-tethered but the more proximal bowel is mobile. "Pie crusting" (sequential scoring of the peritoneal surface of the mesentery perpendicular to the vessels, protecting the vessels themselves) can gain 2–3 cm of additional reach; ligating the ileocolic artery proximally can free additional reach for a difficult end ileostomy. In extremis: a Prasad-style end-loop stoma (both bowel limbs exteriorized, most useful for perforated diverticulitis/trauma when primary anastomosis is inadvisable) allows later reanastomosis as a local procedure without laparotomy. A poor stoma in a good location is generally preferred over a good stoma in a poor location. Rarely, thickened bowel prohibiting eversion/maturation can simply be opened and secured well above skin level (risking reactive serositis or a late "bishop's collar" stricture) as a temporizing measure; an even more hostile abdomen may require a stoma fashioned through the midline incision itself (higher wound infection/hernia risk, but can temporize/palliate an otherwise unsustainable situation). A loop stoma rod tearing through friable mesentery can be managed with two parallel rods, or by bracing the mesentery at the fascial (not skin) level with a remote tube passed through an avascular portion of the mesentery.

Genitourinary stomas

Relevant to colorectal surgeons for stoma-care/revision assistance, reoperative awareness, and multivisceral pelvic-malignancy resections. Ileal conduit (simplest reconstructive urinary diversion): a 10–15 cm ileal segment (≥15–20 cm proximal to the ileocecal valve) connects the ureters to the skin (ureters anastomosed separately — "Bricker" — or together — "Wallace"), with enteric continuity restored via ileo-ileostomy; the left ureter's aberrant course through a sigmoid mesenteric defect is a key reoperative hazard. Ileal bladder augmentation/neobladder: similar principle, harvested ileal segment as panel or pouch; the mesenteric pedicle is a nidus for obstruction/internal herniation if not carefully preserved. Catheterizable stomas (appliance-free continence): Indiana pouch (right colon + ileum reservoir with appendix/terminal ileum as catheterizable channel), Mitrofanoff appendicovesicostomy (appendiceal conduit), Monti conduit (tubularized ileal segment, similar principle to Mitrofanoff).

The Turnbull blowhole colostomy

A rare temporizing option when colectomy or proper fecal division carries prohibitive operative risk — e.g. gravid patients with fulminant colitis (concern for maternal/fetal demise) or profound comorbidity (sepsis, cardiovascular collapse) making total colectomy inadvisable. A limited upper-midline laparotomy allows a loop ileostomy plus exteriorization of a transverse colon loop through the same incision, sealed to the peritoneum to sequester the abdominal cavity before opening the colon and maturing it to the skin — suboptimal (prone to prolapse, difficult pouching given its flat configuration) but useful when no other option exists. Can even be performed under local anesthesia with fluoroscopic colon localization in patients too ill for general anesthesia.

Ileostomy obstruction and foodstuff bolus obstruction

Early postoperative edema at the fascial level can transiently obstruct an ileostomy — suspected with peristomal pain plus thin non-bilious "hydrops" output or no output, confirmed by cross-sectional imaging showing an abrupt caliber transition. Bedside decompression: a well-lubricated 14–18F Foley/red rubber catheter advanced (without balloon inflation) through a two-piece appliance's flange, using small water aliquots via Toomey syringe to ease passage, secured once past the obstruction; indwelling stoma catheters carry a perforation risk with prolonged use. Foodstuff bolus obstruction: the narrow ileostomy lumen can be occluded by poorly-digested high-residue foods (nuts, seeds, shellfish, sausage casings, raw produce) — treated by catheter irrigation with 30–50 mL water aliquots (process may take 1–2 hours) rather than blind catheter advancement past the fascia.

Open items / gaps

• All content above is textbook-level/secondary. No single trial dominates this survey chapter the way named RCTs did in Ch52/Ch53, but several specific studies are worth independent verification given how load-bearing their numbers are to clinical practice: the Scandinavian early-vs-late loop ileostomy closure RCT (informs a genuinely debated timing question), the HASTA multicenter trial (stapled vs. handsewn loop closure), and the stoma-rod meta-analysis (informs whether rods should be used at all). Not yet flagged in Research Priorities.md pending a judgment call on priority relative to the wiki's existing IBD/infectious-colitis backlog — worth revisiting.
• Parastomal hernia is only touched on here via its complication-rate table; full parastomal hernia epidemiology, classification, and repair technique now lives on its own page, Parastomal Hernia Repair (ASCRS Ch55).
• No content yet on stoma-specific considerations in pediatric or pregnant patients beyond the single Turnbull-blowhole-in-pregnancy indication mentioned above.