Malignant priapism occurs when a malignant tumor involves the corpora cavernosa or other erectile tissue.
Clinical features:
(1) The patient presents with priapism.
(2) The patient may or may not have a history of a malignancy.
(3) Imaging studies demonstrate an infiltrative lesion.
(4) A biopsy or aspirate shows malignant cells.
(5) Exclusion of other causes of priapism.
Most cases are due to metastatic carcinoma, usually adenocarcinomas. Primary sites may include:
(1) prostate
(2) colorectum
(3) urinary bladder
(4) lung
(5) melanoma
(6) kidney
(7) esophagus
(8) gastric
Primary tumors are rare explanations and would include:
(1) hemangioendotheliuoma
(2) malignant glomus tumor
(3) malignant lymphoma
