Can Penile Ultrasound Be Performed Without Intracavernosal Injection for Peyronie's Disease?
Yes, ultrasound can be performed without intracavernosal injection (ICI) for initial evaluation of Peyronie's disease, but ICI with ultrasound should be performed before any invasive intervention to properly assess penile deformity in the erect state.
Initial Diagnostic Approach
For the initial diagnosis of Peyronie's disease, the minimum requirements are:
- Detailed history focusing on penile deformity, interference with intercourse, penile pain, and distress
- Physical examination of the genitalia with stretching and palpation of the flaccid penis to assess for palpable abnormalities 1
Ultrasound in the flaccid state can identify plaques without injection, appearing as hyperechoic lesions in 93% of cases 2. This non-invasive approach is useful for:
- Detecting plaque presence and location
- Identifying calcifications (ultrasound has 100% detection rate for calcifications, superior to all other imaging modalities) 3
- Providing objective documentation of plaque characteristics 4
When ICI with Ultrasound Becomes Mandatory
Clinicians should perform an in-office ICI test with or without duplex Doppler ultrasound prior to invasive intervention 1. This is emphasized across all major guidelines as expert opinion.
The ICI test enables critical assessment that cannot be obtained in the flaccid state:
- Penile deformity in the erect state (the actual functional problem)
- Plaque behavior during erection
- Pain assessment during erection
- Vascular integrity when combined with duplex ultrasound
- Differentiation between calcified and non-calcified plaques
- Precise measurements of plaque size and density 1, 5
Clinical Algorithm
For initial evaluation (non-invasive workup):
- History and physical examination with palpation
- Flaccid ultrasound if objective documentation needed or plaque not clearly palpable
- This approach identifies 93% of plaques and all calcifications 2, 3
Before considering surgery or intralesional therapy:
- ICI test is mandatory
- Combine with duplex Doppler ultrasound for complete assessment
- This provides the functional assessment needed for treatment planning 1, 5
Important Caveats
- Palpation remains superior to ultrasound for plaque detection (94% vs 39% sensitivity in one study) 6, though ultrasound better determines depth of fibrosis extension
- Ultrasound without injection has limitations: it cannot assess the functional deformity that occurs during erection, which is the primary concern for treatment planning
- The 2025 EAU guidelines list penile dynamic duplex ultrasonography as a specific diagnostic test indicated for patients with penile deformities requiring surgical correction 7
- Ultrasound is superior to MRI for detecting calcifications, which influences treatment decisions (calcified plaques respond poorly to medical therapy) 8, 3
Bottom line: Use flaccid ultrasound for initial objective documentation if needed, but always perform ICI with ultrasound before proceeding to any invasive treatment to properly assess the erect deformity and vascular status.