Metanephric Adenoma

Metanephric adenoma is a rare benign renal tumor, accounting for 0.2% of adult renal epithelial tumors. It is a hypovascular solid tumor.

It is a well-demarcated mass that usually shows mild enhancement on CT. It may appear hypointense on T2-weighted images. Differential considerations include papillary renal cell carcinoma and angiomyolipoma with minimal fat.

Reference

• Silverman SG, Mortele KJ, Tuncali K, Jinzaki M, Cibas ES. Hyperattenuating renal masses: etiologies, pathogenesis, and imaging evaluation. Radiographics. 2007 Jul-Aug;27(4):1131-43.
• Hwang SS and Choi YJ. Metanephric adenoma of the kidney: case report. Abdom Imaging. 2004 May-Jun;29(3):309-11.