Abstract

Heterotopic mesenteric ossification (HMO) represents a rare reactive condition characterized by abnormal bone formation within the mesentery. HMO's etiology remains enigmatic, with proposed triggers including trauma-induced metaplasia or bone fragment dislodgment from other sites during abdominal surgery. With fewer than 100 documented cases in the literature, much about this condition remains unknown. In this report, we present a notable case of HMO in a 43-year-old man with a history of severe Crohn's disease and multiple abdominal surgeries. Following a period of unresponsiveness at home, he was admitted to the intensive care unit, where he received palliative care due to a poor prognosis. An autopsy revealed mature, benign bone fragments within the mesentery, alongside severe dehydration, likely exacerbated by decreased oral intake and medication cessation related to his ostomy. Although antemortem imaging revealed HMO, it was misattributed to contrast versus calcification. This case underscores the importance of clinician awareness regarding HMO, particularly its potential implications in inflammatory bowel disease. Early recognition and interdisciplinary collaboration among radiologists, pathologists, and clinicians are paramount in optimizing patient outcomes. Further research is warranted to elucidate this intriguing pathology's pathogenesis and best management strategies.

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