| Non-ischemic (high-flow) | Ischemic (low-flow) | |
| Physical Exam | Typically painless, not fully tumescent | Painful, fully tumescent with corpus cavernosa rigidity without involvement of corpus spongiosum and glans penis |
| Aetiology | High-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 |
| Management | NOT Emergency | Emergency |
