Physical Examination for Priapism
In a male presenting with priapism, perform a careful examination of the genitalia, perineum, and abdomen, specifically palpating to determine if the corpora cavernosa are fully rigid and tender (indicating ischemic priapism) versus partially tumescent (suggesting non-ischemic priapism), while noting that the corpus spongiosum and glans penis typically remain soft. 1
Key Physical Examination Components
Genital Examination Focus
The physical examination should systematically assess:
Corporal rigidity pattern: The corpora cavernosa are typically affected in priapism, becoming fully rigid and tender in ischemic cases, while the corpus spongiosum and glans penis remain unaffected and soft 1
Degree of tumescence: Full corporal rigidity with tenderness suggests acute ischemic priapism, whereas partial corporal tumescence without significant pain indicates non-ischemic (high-flow) priapism 1
Perineal assessment: Examine the perineum carefully for signs of trauma, particularly straddle injuries that may indicate arterial (non-ischemic) priapism 1
Distinguishing Ischemic from Non-Ischemic Priapism
The physical examination provides critical diagnostic clues:
Ischemic priapism characteristics:
- Fully rigid, tender corpora cavernosa
- Painful erection
- Soft glans and corpus spongiosum
Non-ischemic priapism characteristics:
- Partially tumescent corpora cavernosa
- Minimal to no pain
- Soft glans and corpus spongiosum
Perineal Compression Test (Piesis Sign)
In suspected non-ischemic priapism, particularly in pediatric cases, mechanical compressive force applied to the perineum may result in detumescence—a finding specifically indicative of arterial (high-flow) priapism 2. This can complement the physical examination when the diagnosis is uncertain.
Common Pitfalls
Do not rely on physical examination alone to definitively distinguish priapism subtypes. While examination findings are highly suggestive, corporal blood gas analysis should be obtained in most acute presentations to confirm the diagnosis 1. The exception is when the diagnosis is abundantly clear by history and examination (such as priapism following intracavernosal injection therapy or in patients with known recurrent ischemic priapism from sickle cell disease) 1.
Do not delay treatment to perform extensive physical examination maneuvers. The examination should be focused and efficient, as ischemic priapism requires intervention within 4 hours to minimize the risk of permanent erectile dysfunction 1, 3.