What management should be recommended for a patient with abdominal distension, loss of haustral markings of the descending colon and a dilated transverse colon on imaging suggestive of colitis, who also has a left ureteral stent?

Management of Abdominal Distension with Colonic Dilatation and Loss of Haustral Markings

This patient requires immediate hospital admission for intensive medical management with joint gastroenterology and surgical consultation, as the imaging findings of dilated transverse colon with loss of haustral markings suggest severe colitis with potential toxic megacolon—a life-threatening emergency. 1

Immediate Assessment and Monitoring

The presence of colonic dilatation (transverse colon >5.5 cm) with loss of haustral markings demands urgent evaluation to prevent perforation and death. You must:

• Admit the patient immediately for intensive monitoring and treatment 1
• Establish joint medical-surgical management from the outset—involve a colorectal surgeon immediately, as 25-30% of severe colitis cases require colectomy 1
• Perform daily abdominal radiographs to monitor colonic diameter progression 1
• Check vital signs four times daily: monitor for fever, tachycardia (>90 bpm), and signs of systemic toxicity 1, 2
• Obtain labs every 24-48 hours: CBC, CRP/ESR, electrolytes, albumin, liver function tests 1
• Maintain a stool chart documenting frequency, character, and presence of blood 1

Critical caveat: The ureteral stent indicates recent urologic intervention—ensure this is not causing secondary colonic issues, though the imaging pattern strongly suggests primary colitis.

Diagnostic Workup Before Treatment

Before initiating therapy, you must:

• Perform flexible sigmoidoscopy within 48 hours to confirm colitis, assess severity, and obtain biopsies 3, 4
• Rule out infectious causes: Send stool cultures, Clostridioides difficile toxin, and CMV testing 3
• Do NOT delay corticosteroid treatment while awaiting stool results if severe colitis is suspected 1

Initial Medical Management

Supportive Care (Start Immediately)

• Make patient NPO (bowel rest) 2
• IV fluid resuscitation to correct dehydration and electrolyte imbalances 1
• Blood transfusion if hemoglobin <10 g/dL 1
• Subcutaneous heparin for thromboembolism prophylaxis 1
• Nutritional support (enteral or parenteral) if malnourished 1
• STOP all anti-motility agents and opiates immediately—these are strongly associated with colonic dilatation and can precipitate toxic megacolon 2

Pharmacologic Treatment

Start IV corticosteroids immediately (equivalent to prednisolone 40-60 mg daily IV) 1, 3. This achieves response in approximately 67% of severe colitis cases 3.

Assess response by Day 3: If insufficient improvement (persistent fever, tachycardia, rising inflammatory markers, or worsening colonic dilatation), escalate to rescue therapy:

• Infliximab 5 mg/kg OR Cyclosporine 2 mg/kg/day IV 3
• Both have comparable efficacy (85% response rate by day 7, colectomy rates 18-21% by day 98) 3
• If accelerated infliximab is needed for refractory cases with megacolon, this can be considered as alternative to surgery 5

Do NOT routinely use antibiotics unless there is evidence of infection, perforation, or sepsis—controlled trials show no consistent benefit in acute colitis 3

Surgical Indications

Proceed to emergency colectomy if:

• Progressive colonic dilatation despite medical management 1, 2
• Signs of perforation (peritonitis, free air) 2, 6
• Severe systemic toxicity unresponsive to medical therapy 1, 3
• Massive hemorrhage 1

The surgical option should be discussed with the patient early, including the 25-30% colectomy risk 1. Early surgical consultation prevents delayed intervention and reduces mortality 2, 7.

Differential Considerations

While inflammatory bowel disease (ulcerative colitis or Crohn's disease) is most likely given the imaging pattern, also consider:

• Ischemic colitis: Can present with loss of haustra and dilatation, especially in older patients or those with vascular risk factors 4, 6
• Infectious colitis: Approximately 1% of infectious diarrhea cases develop colonic dilatation 2
• COVID-19-related colitis: Emerging cause of colonic dilatation with ischemia 8

The initial management approach covers all possibilities, as there are no clinically useful parameters to distinguish these acutely 2.

Key Pitfalls to Avoid

• Never discharge this patient—colonic dilatation with loss of haustra is a surgical emergency until proven otherwise
• Never give anti-motility agents or opiates—95% of colonic dilatation cases have this association 2
• Never delay surgical consultation—waiting too long increases perforation risk and mortality 2, 7
• Never assume the ureteral stent is causing the problem—the imaging pattern indicates primary colonic pathology requiring urgent treatment