Non-ischemic (high-flow)Ischemic (low-flow)
Physical ExamTypically painless, not fully tumescentPainful, fully tumescent with corpus cavernosa rigidity without involvement of corpus spongiosum and glans penis
AetiologyHigh-flow priapism is extremely rare and most commonly associated with antecedent trauma including blunt trauma, or resulting from needle injury of the cavernosal artery.Low-flow priapism is caused by impaired relaxation and/or paralysis of cavernosal smooth muscle and in sickle-cell disease
ManagementNOT EmergencyEmergency