Abstract

Malign priapism (MP) is described due to tumoral invasion or metastasis to the penil corporeal tissue. Paraneoplastic leukemoid reaction (PLR) is reported in nearly all solid tumor types as a paraneoplastic syndrome. It is a reactive leukocytosis where white blood cell(WBC) count exceeds 50x109/L without evidence of leukemia. 3-8% of all priapism cases are caused by malignancy.We present a case of MP, showed up secondary to a PLR which was provoked firstly by the primary renal malignancy and it was again induced four years after by its lung metastasis.To our knowledge, this is the first case in the literature. We’d like to emphesize that there were no evidents of invasion or metastasis to corpus cavernosum. PLR can also give rise to priapism attacks and this may be the first symptom of a malignant condition.