Metastatic mucinous adenocarcinoma arising from chronic fistula-in-ano

An 89-year-old man with chronic fistula-in-ano (FIA) for over 30  years presented with a large, tender, gluteal mass with discharging perianal cutaneous openings (Fig. 1). A colonoscopy 2  years before in another hospital had not detected any suspicious mass.
Source: Japanese Journal of Clinical Oncology - Category: Cancer & Oncology Source Type: research