Ischemic Sigmoid Colon Presenting As Hemoperitoneum From an Avulsed Mesocolon During Colonoscopy: A Case Report and Literature Review.

Colonoscopy has proven efficacy for both screening and diagnostic purposes. Although the risk of complications during colonoscopy is low, it is not negligible. As such, we present the case of a 72-year-old male patient who presented with abdominal pain and positive peritoneal signs post-colonoscopy. He was found to have anemia and acute on chronic kidney disease. An abdominal CT scan found evidence of hemoperitoneum. Subsequently, he underwent a diagnostic laparoscopy converted into an open exploratory laparotomy to identify the source of bleeding, an avulsed mesocolon. A review of the literature regarding colonoscopy and associated complications is discussed, highlighting the importance of risk stratification to better treat patients and prognosticate outcomes.