A 27-year-old female has a history of periodic bloody diarrhea over several years. Colonoscopy shows sigmoid colon inflammation, and the patient complains of joint pain in her knees and ankles. You suspect inflammatory bowel disease. Which of the following would suggest a diagnosis of Crohn disease:

Mucosal and submucosal ulcerations

A 64-year-old woman has progressively worsening abdominal pain 5 hours after an open valve replacement with cardiopulmonary bypass. The pain is crampy and associated with an urge to defecate. The patient reports having had 2 bloody bowel movements in the last hour. Her operation was complicated by significant intraoperative blood loss, which prolonged the operation and necessitated 2 transfusions of red blood cells. She has hypercholesterolemia and type 2 diabetes mellitus. The patient received prophylactic perioperative antibiotics and opioid pain management during recovery. Her temperature is 37.9°C (98.9°F), pulse is 95/min, and blood pressure is 115/69 mm Hg. Examination shows a soft abdomen with mild tenderness to palpation in the left quadrants but no rebound tenderness or guarding. Bowel sounds are decreased. Rectal examination shows blood on the examining finger. Which of the following is the most likely underlying cause of this patient's symptoms?

Decreased blood flow to the splenic flexure

Embolization of superior mesenteric artery

Atherosclerotic narrowing of the intestinal vessels

Small outpouchings in the sigmoid wall

Infection with Clostridioides difficile

A 31-year-old woman comes to the emergency department because of a 4-day history of fever and diarrhea. She has abdominal cramps and frequent bowel movements of small quantities of stool with blood and mucus. She has had multiple similar episodes over the past 8 months. Her temperature is 38.1°C (100.6°F), pulse is 75/min, and blood pressure is 130/80 mm Hg. Bowel sounds are normal. The abdomen is soft. There is tenderness to palpation in the left lower quadrant with guarding and no rebound. She receives appropriate treatment and recovers. Two weeks later, colonoscopy shows polypoid growths flanked by linear ulcers. A colonic biopsy specimen shows mucosal edema with distorted crypts and inflammatory cells in the lamina propria. Which of the following is the most appropriate recommendation for this patient?

Start annual colonoscopy starting in 8 years

Obtain barium follow-through radiography in 1 year

Obtain glutamate dehydrogenase antigen immunoassay now

Start annual magnetic resonance cholangiopancreatography screening in 10 years

Three hours after undergoing open proctocolectomy for ulcerative colitis, a 42-year-old male complains of abdominal pain. The pain is localized to the periumbilical and hypogastric regions. A total of 20 mL of urine has drained from his urinary catheter since the end of the procedure. Temperature is 37.2°C (98.9°F), pulse is 92/min, respirations are 12/min, and blood pressure is 110/72 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 99%. Physical examination shows a 20 cm vertical midline incision and an ileostomy in the right lower quadrant. There is no fluid drainage from the surgical wounds. The urinary catheter flushes easily and is without obstruction. Cardiopulmonary examination shows no abnormalities. Serum studies show a blood urea nitrogen of 30 mg/dL and a creatinine of 1.3 mg/dL. Which of the following is the most appropriate next step in management?

Administer intravenous furosemide

A 45-year-old man is brought to the emergency department because of severe abdominal pain for the past 2 hours. He has a 2-year history of burning epigastric pain that gets worse with meals. His pulse is 120/min, respirations are 22/min, and blood pressure is 60/40 mm Hg. Despite appropriate lifesaving measures, he dies. At autopsy, examination shows erosion of the right gastric artery. Perforation of an ulcer in which of the following locations most likely caused this patient's findings?

Lesser curvature of the stomach

Greater curvature of the stomach

Inflammatory bowel disease surgical management for USMLE Step 3: High-Yield Surgery Lessons

🔪 Pathophysiology - Why Surgery?

Surgery is indicated when medical therapy fails or when complications of chronic inflammation arise. The goal is to manage structural damage, control sepsis, or prevent malignancy.

Common Indications:

Failure of Medical Therapy: Disease refractory to biologics/immunomodulators.
Complications (Crohn's): 📌 F-SOAP
- Fistula, Stricture/Obstruction, Abscess, Perforation.
Complications (UC):
- Toxic megacolon (colonic diameter >6 cm)
- Fulminant colitis unresponsive to therapy.
- Uncontrolled hemorrhage.
- Dysplasia or colorectal cancer (CRC).

Crohn’s disease stricture management algorithm

⭐ Surgery is curative for Ulcerative Colitis (total proctocolectomy), but only palliative for Crohn's Disease due to high recurrence rates.

🔪 Surgical Indications

⭐ UC: Total proctocolectomy is curative. Crohn's: Surgery is palliative for complications; recurrence is common, often at the anastomosis.

Emergent/Urgent:

Toxic megacolon (transverse colon >6 cm + toxicity)
Bowel perforation
Massive, uncontrolled hemorrhage
Fulminant colitis refractory to 72 hrs of IV steroids

Elective:

Medically refractory disease (steroid dependence, growth failure)
Dysplasia or carcinoma on surveillance colonoscopy
Crohn's-specific: Symptomatic strictures, non-healing fistulas, intra-abdominal abscesses

CT/MR/3D reconstruction of Crohn's disease stricture

🛠️ Management - The Surgeon's Toolkit

Crohn's Disease (CD): Bowel Conservation is Key

Strictureplasty: Widens fibrotic strictures (e.g., Heineke-Mikulicz) without resection, preserving bowel length.
Limited Resection: For complications like fistula, abscess, perforation, or obstruction. Remove only grossly affected bowel with clear margins.
Anastomosis: Side-to-side (e.g., Kono-S) may ↓ recurrence vs. end-to-end.

Ulcerative Colitis (UC): Resection is Curative

Total Proctocolectomy (TPC) with Ileal Pouch-Anal Anastomosis (IPAA / J-Pouch):
- Gold standard for elective cases (dysplasia, refractory disease).
- Restores fecal continence. ⚠️ Risk of pouchitis.
TPC with End Ileostomy (Brooke Ileostomy): For patients not candidates for IPAA (poor sphincter function, distal rectal cancer).
Emergent Subtotal Colectomy: For toxic megacolon/perforation. Leaves rectal stump (Hartmann's pouch); IPAA can be done later (staged procedure).

⭐ Surgical Philosophy: Surgery for UC is curative (removes all diseased mucosa), while for CD it is palliative for complications, as disease often recurs proximal to the anastomosis.

3-Stage J-Pouch Surgery for Ulcerative Colitis

⚠️ Complications - Post-Op Perils

Anastomotic Leak:
- Most feared early complication.
- Presents with fever, tachycardia, peritonitis.
- Dx: CT with oral/rectal contrast.
Small Bowel Obstruction (SBO):
- Commonly due to adhesions.
Pouch-Specific (IPAA for UC):
- Pouchitis: Most common long-term issue; inflammation of the ileal pouch.
- Cuffitis: Inflammation of the rectal cuff remnant.
Crohn's Disease Specific:
- High rate of disease recurrence at the anastomotic site.

⭐ Pouchitis after IPAA presents with ↑ stool frequency, urgency, and cramps. First-line treatment is antibiotics (Metronidazole or Ciprofloxacin).

⚡ Biggest Takeaways

Ulcerative Colitis (UC) surgery is curative; Crohn's Disease (CD) surgery is palliative for complications.

The standard procedure for UC is total proctocolectomy with ileal pouch-anal anastomosis (IPAA).

Pouchitis is the most common long-term complication of an IPAA; treat with metronidazole/ciprofloxacin.

For CD, the goal is bowel preservation; strictureplasty is preferred over resection for fibrotic strictures.

Key indications for UC surgery: dysplasia/cancer, toxic megacolon, or medically refractory disease.

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