Pseudo-priapism! Forgotten semirigid penile prosthesis.

Priapism is an undue and sustained erection in the absence of sexual stimulus. In the elderly population drug induced, thromboembolic and malignant aetiologies are common. This report demonstrates that in elderly demented patients, penile prosthesis should be considered in the differential diagnosis of such a condition. A plain X-ray of the pelvic region incorporating the penis could prove very useful, particularly in the absence of a proper history.