An Intra-Abdominal Hibernoma

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  • 腹腔内褐色脂肪腫の1例

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Abstract

<p>A left upper abdominal mass was identified on CT in a 66-year-old woman in September, 2014. The mass had been growing slowly since it was first identified 6 years previously. The CT showed an 85×55×35 mm hypervascular mass in contact with the descending colon. This mass was fed by the inferior mesenteric artery and the left branch of the middle colic artery, and drained into the superior mesenteric vein. Colonoscopy revealed no tumorous lesions in the colon. Laparoscopy-assisted surgery was performed. The left colic artery was divided at first and the descending colon with the tumor mobilized. The descending colon with the tumor was removed through a small umbilical incision. The tumor was brownish-red and was removed from the descending colon easily by dividing the artery and vein near the tumor. Pathological examination showed an increase in tubercle fat cells including brown pigment. We diagnosed it as a hibernoma. Hibernoma, which is also called a hibernating adenoma, is a rare benign tumor that usually occurs in the femoral, back, and shoulder areas. It develops from brown fat tissue. It is vital to perform regular follow-up imaging in order to not miss the correct timing of resection because although it is a benign tumor it has a tendency to increase gradually in size.</p>

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