[A Case of Renal Myopericytoma]

A 62-year-old female was referred to our hospital for further evaluation of a right renal mass. Contrastenhanced computed tomography (CT) revealed a 36 mm solid mass in the middle portion of the right kidney with early enhancement and washout, leading to a preoperative diagnosis of right renal cell carcinoma (cT1aN0M0, stage I). The patient underwent robot-assisted partial nephrectomy (RAPN). Histopathological examination showed spindle-cell proliferation arranged concentrically around the blood vessels, and immunohistochemical staining was positive for calponin and α-SMA, confirming the diagnosis of myopericytoma. No recurrence or metastasis was observed during the six months of follow-up.