Glans Characteristics in Ischemic Priapism
In ischemic priapism, the glans penis remains soft, flaccid, and typically maintains normal color and sensation because it is supplied by the corpus spongiosum, which is NOT affected by the ischemic process. 1
Key Physical Examination Findings
What IS Affected
- Corpora cavernosa: Fully rigid and tender
- These paired erectile bodies become engorged with hypoxic, acidotic blood (PO2 <30 mmHg, PCO2 >60 mmHg, pH <7.25) 1
What is NOT Affected
- Glans penis: Remains soft and uninvolved
- Corpus spongiosum: Not affected by the ischemic process
- Both structures maintain normal perfusion and appearance 1
Clinical Reasoning
The anatomical distinction is critical for diagnosis. The 2021 AUA/SMSNA guidelines explicitly state that during physical examination of the genitalia, perineum, and abdomen, "the corpora cavernosa are typically affected, while the corpus spongiosum and the glans penis are not" 1. This creates the characteristic finding of a rigid penile shaft with a soft, normal-appearing glans.
Why This Matters Diagnostically
This differential involvement helps distinguish ischemic from non-ischemic priapism:
- Ischemic priapism: Fully rigid corpora with soft glans
- Non-ischemic priapism: Partial corporal tumescence 1
Important Clinical Caveat
Do not confuse this with glans ischemia from other causes. Glans ischemia can occur as a complication of:
- Penile prosthesis implantation (especially with prior pelvic radiation or excessive compression) 2
- Circumcision with vascular compromise 3, 4
- Prolonged untreated priapism with secondary vascular complications 5
However, in acute ischemic priapism itself, the glans maintains normal perfusion, color (not cyanotic or pale), and sensation because its blood supply comes from terminal branches of the internal pudendal artery via the corpus spongiosum, which remains patent 1.