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a, b. A 45-year-old woman with surgically proven lipomatous hemangiopericytoma of the left kidney. Unenhanced axial CT scan (a) demonstrates an irregular mass (arrows) with islets of gross macroscopic fat (arrowheads). Postcontrast axial CT image (b) shows heterogeneous enhancement of the lesion (arrows). The borders of the lesion are better delineated on contrast-enhanced CT.
