Metanephric Adenoma Mimicking Renal Cell Carcinoma On Tc-99m-Mibi Spect/Ct

Metanephric adenoma is a rare benign renal tumor. A 49-year-old woman presented with a left renal pelvic mass detected by ultrasound. Enhanced CT of the kidney showed slight enhancement of the mass. For characterization of the mass, Tc-99m-MIBI SPECT/CT was performed showing photopenia of the mass. Renal cell carcinoma was suspected. The mass was removed surgically. Metanephric adenoma was confirmed by histopathology. This case indicates that metanephric adenoma can appear cold on Tc-99m-MIBI SPECT/CT, mimicking renal cell carcinoma.