Splenic hamartoma.

A 73-year-old female with a calcified splenic mass received exploratory laparotomy and subsequent splenectomy. The histologic diagnosis of the splenic tumor was hamartoma associated with secondary cystic degeneration and calcification of the cyst wall. The tumor was composed of red pulp-like and white pulp-like areas. The former contained many plasma cells and hyalinized trabecular vessels, while the main component in the latter was lymphocytes. Splenic hamartoma was first described by ROKITANSKY in 1861 under the name of "splenoma". Usually, this rare tumor is asymptomatic and represents an incidental finding at autopsy. To the best of our knowledge, this is the second case report of splenic hamartoma in Japan. The clinicopathological features of splenic hamartoma are briefly reviewed.