Abstract
A 44-year-old woman with right abdominal pain and fever was seen at our hospital. There were tenderness and muscular defense at that point, and computed tomography showed a mass about 6 cm in size between the gallbladder and transverse colon. As the symptom and anemia were slight, she was treated by conservative therapy for 10 days, and discharged. While the mass became smaller on computed tomography after a month, laparoscopic surgery was performed for the diagnosis and treatment with the patient's consent. Intraoperatively, a hematoma measuring 2 cm was observed in the greater omentum on the right side. Partial omentectomy with the hematoma was performed. Histologically, it was diagnosed as organized hematoma without infarction, neoplastic lesion, endometrial cell etc. Because of no history of abdominal injury, it was diagnosed an idiopathic omental hematoma.
Idiopathic omental hematoma has been reported in 12 cases in Japan including our case. When we diagnose a cryptogenic intraabodominal hematoma, an idiopathic omental hematoma should be taken into consideration.
