Cecal Granularity and Erythema: Endoscopic Findings and Differential Diagnosis

Granularity (loss of normal vascular pattern, fine nodularity) and erythema (mucosal redness) in the cecum indicate mucosal inflammation. The differential is broad.

Differential Diagnosis

Condition	Endoscopic Features	Key Associations
Infectious colitis	Diffuse or patchy erythema, granularity, ulcerations, exudate. C. difficile: pseudomembranes (yellow-white plaques).	Antibiotic exposure, hospitalization, immunocompromise. Stool PCR panel, toxin, culture.
Crohn's disease	Aphthous ulcers → longitudinal/deep ulcers, cobblestoning, skip lesions. Cecum/terminal ileum common. Granularity early.	Young adult, abdominal pain, diarrhea, weight loss, perianal disease. Biopsy: non-caseating granulomas (30%).
Ulcerative colitis	Continuous from rectum. Cecal involvement = pancolitis. Erythema, granularity, friability, ulceration.	Bloody diarrhea, urgency. Biopsy: crypt distortion, basal plasmacytosis.
Ischemic colitis	Segmental erythema, edema, "thumbprinting," mucosal sloughing. Watershed areas (splenic flexure, rectosigmoid). Cecal = "cecal basalgia."	>60, vascular disease, hypotension, dialysis, vasculitis. Acute pain, bleeding.
Diverticular disease	Diverticula ± inflammation (diverticulitis). Peri-diverticular erythema, granularity.	Left-sided usually; right-sided more common in Asia. CT confirms.
Drug-induced	NSAIDs (diaphragm disease), checkpoint inhibitors (colitis), gold, mycophenolate.	Medication history critical.
Radiation colitis	Pale, friable, telangiectasias, strictures. Latency 6 mo–30 yr.	Prior pelvic RT.

Next Steps

• Biopsies: Multiple, from affected and normal-appearing mucosa (proximal/distal).
• Stool studies: C. diff PCR/toxin, culture, ova/parasites, calprotectin.
• Labs: CBC, CRP, ESR, albumin, iron studies, celiac serology.
• Cross-sectional imaging: CT enterography or MR enterography for small bowel (Crohn's).

Clinical Pearl

"Cecal granularity" alone is nonspecific. Pattern (diffuse vs. segmental), associated findings (ulcers, pseudomembranes, ileal involvement), and histology define etiology.