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Huge renal lipoma with prominent hypervascular non-adipose elements

Departments of ¹Radiology ⁴Pathology, , Kaohsiung Municipal Hsiao-Kang Hospital, Kaohsiung Medical University, ³ Division of Medical Imaging, ⁴ Department of Urology, Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan

Correspondence: Tsyh-Jyi Hsieh, 13Fl, No. 392, Nan-Ping Road, Kaohsiung, Taiwan. E-mail: hh2001{at}ms69.hinet.net.

A primary renal lipoma is a very rare neoplasm of the kidney and only 20 cases have been reported in the literature. We report a case of a huge retroperitoneal mass that presented as a hypervascular tumour with a prominent fat component, mimicking an angiomyolipoma or a liposarcoma in imaging studies. This finding presented a diagnostic challenge in terms of selecting medical versus surgical intervention. Surgical excision of the lesions was performed and the pathological evaluation revealed a renal lipoma with extrarenal growth.