Polymyositis: a manifestation of chronic graft-versus-host disease.

Polymyositis developed in a patient who had had bone marrow transplants for the treatment of acute myeloid leukemia. There was no previous evidence of graft-versus-host disease. Polymyositis has previously been reported to be associated with graft-versus-host disease; this article suggests that polymyositis may represent its sole manifestation.