Papillary renal cell carcinoma radiographically mimicking massive calcification.

Abstract  A  53-year-old  male  was  referred  to  the  Department  of  Urology,  Hokkaido  Kouseiren  Kutchan Kousei Hospital for a left renal mass incidentally found by computed tomography. The tumor was 29 mm in diameter and showed ring-like calcification and heterogeneous enhancement by the contrast medium. The patient underwent left partial nephrectomy after the diagnosis of left renal cell carcinoma. Contrary to the radiographic finding, there was no palpable calcified lesion in the macroscopic specimen. Histopathologically, the tumor showed features of papillary renal cell carcinoma with massive psammoma bodies which might have been the cause for mimicking radiographic calcification.