Benign thymoma and selective erythroid aplasia of the bone marrow.

The occurrence of red cell aplasia of the bone marrow and benign thymoma is a rare but well-defined syndrome. Data presented suggest the presence in the serum of a patient who had thymoma, of a humoral factor which may inhibit erythropoiesis. Further attempts should be made to clarify the association of thymoma and anerythroid anemia.