Case 57
Clinical Presentation
A 39-year-old woman who underwent computed tomography for vague abdominal symptoms.
Imaging Findings
Contrast-enhanced computed tomography (CT) image at the level the kidneys shows a 2.5-cm–diameter focal lesion (arrow) with attenuation similar to that of the subcutaneous fat (asterisk). The lesion extends from the renal sinus to the renal capsule. A vessel (arrowhead) is seen coursing in the mass. No calcifications are noted.
Differential Diagnosis
• Angiomyolipoma: With very few exceptions, a fat-containing lesion in the renal parenchyma is an angiomyolipoma. Vascularity and soft tissue within the tumor are an inherent part of the neoplasm.
• Fat-containing renal cell carcinoma: Renal cell carcinoma may incorporate fat by various mechanisms. However, this is extremely rare. Other than in a few recent case reports, almost all fat-containing renal cell carcinomas also show calcifications.
• Retroperitoneal liposarcoma:
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