Hygroma renalis: an extremely rare renal lesion.

Received July 2006 Accepted March 2007 INTRODUCTION Lymphangiomas are benign tumors or malformations of lymphatic vessels. They are most commonly seen in the neck, axillary region, and mediastinum. Hygroma renalis is a type of lymphangioma (lymphangiectasia) located in the pericalyceal area and is therefore named as pericalyceal lymphangiectasis.(1,2) Hygroma renalis is usually asymptomatic and easily detectable by ultrasonography or computed tomography (CT). We present a patient with vague right lumbar pain and fullness. Radiologic examination revealed a multicystic pericalyceal and perirenal lesion. Histological examination and immunohistochemistry analysis were consistent with the diagnosis of hygroma renalis.