Abstract
INTRODUCTION: Colonoscopy is a well-accepted procedure applied worldwide in diagnosis and management of colon lesions. The incidence of reported complications is not rare. PRESENTATION: A 79-year-old man with postcolonoscopy intraperitoneal bleeding secondary to superior rectal artery injury. He received computer tomogram and angiogram study to confirmed bleeder from right superior rectal artery and subsequently managed with embolization and operation. DISCUSSION: This is the second case report in the literatures of mesentery tear and the first case with massive hemoperitoneum. CONCLUSION: Identification and careful evaluation are crucial for successful diagnosis and treatment in cases such as this after colonoscopy.