Metachronous Bilateral Renal Lymphangiomatosis Mimicking as a Simple Renal Cyst

Hoon Ah Jang, Jeong Hyun Ban, Myeong Heon Jin, Mi Mi Oh, Du Geon Moon, Duck Ki Yoon From the Department of Urology, Korea University College of Medicine, Seoul, Korea Renal lymphangiomatosis is a rare developmental malformation of the perirenal lymphatic system, and this can result in the development of cystic masses in the peri-pelvic or peri-renal areas. This is difficult to differentiate from other cystic renal disease on imaging studies. We present here a case of metachronous bilateral renal lymphangiomatosis that was falsely diagnosed as a simple renal cyst. A 47 year-old man was referred for a large amount of drainage after right renal cyst marsupialization. The abdominal computed tomography (CT) findings and fluid analysis were compatible with a lymphangiomatosis. After 6 month, he presented with flank pain on his left side and CT showed intracystic hemorrhage on the left renal lymphangiomatosis. Percutaneus drainage and conservative management were done. (Korean J Urol 2008;49:454-456) ????????????????????