Bone marrow fibrin ring granulomas and cytomegalovirus infection.

Fibrin ring granulomas of the bone marrow are described in two organ transplant patients (one renal, one cardiac) with disseminated cytomegalovirus infection. Infection was documented by viral cultures and seroconversion, and in both cases typical cytomegalic cells were identified in proximity to the fibrin ring granulomas. These represent the first case reports of bone marrow fibrin ring granulomas associated with cytomegalovirus.