When evaluating stoma necrosis, which condition should be ruled out to avoid misdiagnosis?

• A. Pouchitis
• B. Stoma stenosis
• C. Melanosis coli from cascara use
• D. Fistula

Answer: (C)

When evaluating potential stoma necrosis, the key is to distinguish true nonviable tissue from benign color changes that can mimic it. Melanosis coli from cascara use can produce dark brown to black mucosal pigmentation of the colon, which may involve the mucosa near the stoma. This pigment can look like necrosis at a glance, but the tissue remains viable if other signs of death are absent. So, ask about laxative use and assess tissue viability carefully: true necrosis shows nonviable tissue that is pale or dusky, non-bleeding, and lacks capillary perfusion, while melanosis coli presents as pigmented but still viable mucosa with normal perfusion.

Other conditions like pouchitis, stoma stenosis, or a fistula affect function or anatomy rather than causing pigmented, nonviable tissue around the stoma, so they don’t typically mimic necrosis in the same way pigmentation from cascara can.