title: Cavernous hemangioma mimicking a cystic renal cell carcinoma.
abstract: A 69-year-old man was hospitalized for treatment of a left renal tumor. The tumor had originally been demonstrated as a simple renal cyst 4 years before. However, the size of the tumor decreased, and at the time of hospitalization, the tumor showed a solid, papillary component that was enhanced by contrast medium on computed tomography (CT) and had high signal intensity on T2-weighted magnetic resonance imaging (MRI). We diagnosed this tumor as a cystic renal cell carcinoma of the left kidney, cT1aN0M0, arising from the epithelium of a renal cyst, and performed a left partial nephrectomy. The pathological diagnosis was cavernous hemangioma of the left kidney. Generally, it is difficult to diagnose a cavernous hemangioma of the kidney preoperatively. This case is unusual because the configuration of this tumor changed within a few years. When we find a renal cyst with a solid component, renal cavernous hemangioma arising from the cyst wall should be considered in the differential diagnosis, and a conservative surgical approach should be considered.
authors.affiliation: Department of Urology, Institute of Clinical Medicine, 1-1-1 Tennodai, Tsukuba, Ibaragi, 305-8575, Japan. tach-tech-voice@mvb.biglobe.ne.jp
authors.forename: Ei-Ichiro
authors.initials: E
authors.lastname: Takaoka
authors.forename: Noritoshi
authors.initials: N
authors.lastname: Sekido
authors.forename: Makito
authors.initials: M
authors.lastname: Naoi
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Matsueda
authors.forename: Koji
authors.initials: K
authors.lastname: Kawai
authors.forename: Toru
authors.initials: T
authors.lastname: Shimazui
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Akaza
mesh_terms: D000368:Aged; D002292:Carcinoma, Renal Cell / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006392:Hemangioma, Cavernous / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000150:complications / Q000175:diagnosis; D007680:Kidney Neoplasms / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging; D014057:Tomography, X-Ray Computed