Peliosis of the spleen.

Peliosis of the spleen is a rare condition that accompanies peliosis hepatis. Two cases are presented, and a detailed morphologic description is given. The lesions are confined to the red pulp and appear to arise by progressive distention of splenic sinuses, with eventual thrombosis and organization. Peliotic involvement of the spleen is probably more common than realized and can have serious clinical implications.