[Ischemic Priapism Associated with Essential Thrombocythemia : A Case Report].

A 71-year-old man visited a local urologist with the complaint of continuous painful erection for three days. Penile cavernosal blood data showed acidosis and hypoxia. Thus he was diagnosed with ischemic priapism. After penile aspiration and injection of phenylephrine, erection was temporary improved. The blood platelet count was 94.5×104/μl and myeloproliferative disease was suspected. He was referred to our hospital and visited us the following day. Since priapism relapsed, we aspirated corpus cavernosum of the penis and injected phenylephrine which was successful. A bone marrow biopsy and genetic test were performed at the department of hematology and the diagnosis of essential thrombocythemia with JAK2 gene mutation was confirmed. By treatment with hydroxyurea, the blood platelet count decreased without priapism recurrence.