佐藤 郁郎¹, 林 仁守¹, 小笠原 鉄郎¹, 中野 修道²

Ikuro SATO¹, Insu LIM¹, Tetsuo OGASAWARA¹, Nobumichi NAKANO²

¹東北労災病院内科, ²東北労災病院泌尿器科

¹Department of internal medicine,Tohoku Rosai Hospital, ²Department of urology,Tohoku Rosai Hospital

キーワード : adrenal myelolipoma , ultrasonography, ultrasonically guided aspiration biopsy , computed tomography

　Adrenal myelolipoma in two patients was found during the course of US survey for liver cirrhosis or chronic hepatitis. They were shown as a uniform and markedly echogenic mass on US. On XCT, they were demonstrated as an uniform and fat density mass. Aspiration biopsy was carried out under ultrasonic guidance. In the first case, the presence of atypical cells suggested a retroperitoneal malignant tumor. In the second, aspiration biopsy specimen showed myeloid elements with adipose cells, and it was possible to diagnose myelolipoma preoperatively. A 6×6 cm encapsulated and well-circumscribed tumor weighed 50 g was resected in the first, and a 3×3 cm tumor weighed 10 g was resected in the second. These tumors were composed of adipose tissue and hemopoietic tissue, and looked like the normal bone marrow. Final diagnosis was adrenal myelolipoma, an uncommon, benign and hormonally nonfunctioning tumor, and these appear to be the smallest of all the 28 reported cases. Therefore, we may conclude that US is useful for the detection of myelolipoma tumors.