Unsuspected invasive gastrointestinal mucormycosis masquerading as inflammatory bowel disease: A pathologist's perspective.

Mucormycosis is caused by fungi of the order Mucorales and class Zygomycetes. It is a rare opportunistic infection frequently associated with immunocompromised status. It can be disseminated disease or localized, which includes rhinocerebral, pulomonary, cutaneous, and gastrointestinal mucormycosis. Gastrointestinal mucormycosis is the most uncommon usually fatal disease accounting for 4-7% of all cases. We present a rare case of unusual presentation of angioinvasive colonic mucormycosis in a seemingly immunocompetent female masquerading as inflammatory bowel disease. It is very important to differentiate between both because treatment with steroids may lead to dissemination of disease ultimately resulting in a fatal outcome. A surgeon should maintain a high index of suspicion as timely appropriate surgical intervention along with effective antifungal treatment remains the cornerstone of treatment for this highly fatal disease. The definitive diagnosis is possible only by histopathological demonstration of tissue invasion. This requires a quantitatively and qualitatively adequate tissue biopsy.