大橋 英行¹, 岡 薫¹, 竹原 靖明², 関根 英明³, 北原 聡史³, 永松 秀樹³

Hideyuki OHASHI¹, Kaoru OKA¹, Yasuaki TAKEHARA², Hideaki SEKINE³, Satoshi KITAHARA³, Hideki NAGAMATSU³

¹関東中央病院泌尿器科, ²関東中央病院画像診断科, ³東京医科歯科大学医学部泌尿器科

¹Department of Urology, Kanto Central Hospital, ²Department of Diagnostic Imaging, Kanto Central Hospital, ³Department of Urology, Tokyo Medical and Dental University

キーワード : Angiomyolipoma, Renal cell carcinoma, Marked hyperechoic nodules, Hypoechoic mass

　A case of bilateral and multiple renal angiomyolipoma without tuberous sclerosis was reported. There were multiple marked hyperechoic nodules in bilateral kidney and a large hypoechoic mass at the lower pole of the left kidney. We considered the nodules as multiple angiomyolipoma and the mass as renal cell carcinoma. But pathologically, both were angiomyolipoma and the former were mainly composed of lipoma and the latter was mainly composed of myoma. Angiomyolipoma has come to be easy to diagnose by CT, Ultrasound and so on, but hypoechoic angiomyolipoma lacking in adipose cells is still apt to be confused with renal cell carcinoma. We realized keenly that needle biopsy or aspiration cytology should be done in such a case.