Mesoblastic nephroma in adulthood: A case report

Background: Mesoblastic nephroma is an uncommon renal tumor of infancy and rarely occurs in adults. We report an adult case of mesoblastic nephroma. Methods: A 50-year-old woman was found incidentally to have a right renal m ass by abdominal ultrasonography. Computed tomography and magnetic resonanc e imaging revealed a heterogeneous tumor and angiography showed a mixture o f hypervascularity and hypovascularity. Right radical nephrectomy was perfo rmed. Results:. The tumor was an encapsulated yellowish solid mass. Microscopical ly, the tumor was composed of spindle cell proliferation. Atypia and mitose s were not identified. Among the tumor cells, there were tubular arranged e pithelial elements. Conclusion: The patient was free of recurrence 14 months postoperatively. M esoblastic nephroma is classified as a benign tumor but recurrence and mali gnant formation of this tumor have been reported so regular postoperative f ollow up is required.