A case of an incidentally found, asymptomatic, right kidney mass seen by ultrasound.

Initial suspicions on CT imaging of either renal cell carcinoma or benign mass lesion resulted in a radical nephrectomy of the right kidney.

Postoperative pathological examination of the mass revealed a renal leiomyoma, a rare, benign tumor that is mostly indistinguishable from malignant tumors on imaging.