Metastatic PEComa arising from renal angiomyolipoma: MRI findings.

The perivascular epithelioid cell tumor (PEComa) is a neoplasm composed primarily of HMB-45-positive epithelioid cells with a perivascular distribution. Both benign and malignant PEComas have been reported in diverse anatomic locations. We report the MRI features of a metastatic PEComa to the liver that originated within a renal angiomyolipoma (AML). J. Magn. Reson. Imaging 2007;26:159–161. Published 2007 Wiley-Liss, Inc.