We report the case of a 69-year-old man who underwent a radical left nephrectomy for a renal mass. Microscopically, the features were those of a clear cell–type renal cell carcinoma associated with 2 foci of capillary hemangioma-like vascular proliferation in the adjacent renal parenchyma. The main differential diagnosis and the possible pathogenesis of this vascular lesion are discussed.
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KuhnEDe AndaJManoniSNettoGRosaiJ. Renal cell carcinoma associated with prominent angioleiomyoma-like proliferation: report of 5 cases and review of the literature. Am J Surg Pathol. 2006;30:1372-1381.
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MehtaVAnanthanarayananVAnticT. Primary benign vascular tumors and tumorlike lesions of the kidney: a clinicopathologic analysis of 15 cases. Virchows Arch. 2012;461:669-676.
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BrownJGFolpeALRaoP. Primary vascular tumors and tumor-like lesions of the kidney: a clinicopathologic analysis of 25 cases. Am J Surg Pathol. 2010;34:942-949.
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LeBoitPE. Lobular capillary proliferation: the underlying process in diverse benign cutaneous vascular neoplasms and reactive conditions. Semin Dermatol. 1989;8:298-310.
