Miíase de cólon

Abstract

Male individual, 68 years old, married and living in São Paulo (state of São Paulo, Brazil) was referred to Hospital Sírio-Libanês for investigation of episodes of melena. A colonoscopy was requested. The colonoscopy was performed with introduction of the colonoscope up to the terminal ileum. This intestinal part showed normal endoscopic appearance. The colonoscopy revealed an ulcerated fungating lesion with an infiltrative appearance in the rectosigmoid transition. Biopsies were performed in this region. The histopathological diagnosis was infiltrative adenocarcinoma. A rectal sessile polyp was found measuring 0.3 cm and showing regular margins and smooth surface. A polypectomy was carried out. The histopathological diagnosis was tubular adenoma with low-grade dysplasia. In the transverse colon, there was a tiny ring-like parasite that was motionless and was not attached to the colon mucosa. Parasite removal was attempted using a biopsy forceps, but there was fragmentation of the specimen. The photos of the examination were analyzed by a pathologist who concluded that it was a myiasis.