Myeloid metaplasia in the gall bladder: a case report.

Idiopathic myelofibrosis is often associated with myeloid metaplasia (extramedullary haemopoiesis) in the spleen and liver. However, the gall bladder is an extremely unusual site for it to occur. A 59 year old man with myelofibrosis, who underwent cholecystectomy for chronic cholecystitis, showed myeloid metaplasia in his gall bladder. Pathologically, this may lead to diagnostic difficulties.