Locally Aggressive Hepatic Echinococcosis With Colonic Involvement Requiring a Right Hemicolectomy: A Case Report and Focused Literature Review

. Emergency laparotomy revealed dense inflammatory adherence to the transverse mesocolon and colon with obliteration of the dissection planes, necessitating right hemicolectomy with ileotransverse anastomosis, partial cyst wall excision, and drainage. Histopathology confirmed echinococcosis with extensive fibrosis, abscess formation, necrosis, and intestinal-surface involvement. The morphology raised suspicion for alveolar echinococcosis, although species-level confirmation was unavailable. The patient recovered uneventfully and received albendazole. This case highlights that chronically infected hepatic echinococcosis may mimic locally invasive disease and require adjacent-organ resection even without a demonstrable cystocolonic fistula.