How should a hard‑flaccid penis be examined for Peyronie's disease, including palpation and imaging?

Examination of Hard-Flaccid Penis for Peyronie's Disease

When examining a penis in the hard-flaccid state for Peyronie's disease, perform stretching and palpation of the flaccid penis to detect plaques, but recognize that plaques are often NOT palpable in the non-erect state—therefore, you must proceed to intracavernosal injection (ICI) testing with or without duplex Doppler ultrasound to definitively assess penile deformity, plaque location, and characteristics in the erect state. 1

Why Flaccid Examination is Insufficient

The AUA guidelines explicitly state that "the patient and clinician usually cannot palpate any abnormalities on the penile shaft in the non-erect state" 1. This is a critical limitation that many clinicians overlook. While you should still perform a careful flaccid examination, understand that a negative finding does not rule out Peyronie's disease.

Flaccid Examination Technique

During the flaccid state examination:

• Stretch the penis along its length while palpating systematically along the entire penile shaft 1
• Palpate for indurated plaques or thickening of the tunica albuginea
• Document circumcision status and any anatomical anomalies
• Note any visible deformity even in the flaccid state

Common pitfall: Many plaques, particularly those at the penile base or those that are non-calcified, will not be palpable during flaccid examination 2, 3.

Mandatory Next Step: Induced Erection Assessment

The AUA guidelines are unequivocal: clinicians should perform an in-office intracavernosal injection (ICI) test with or without duplex Doppler ultrasound prior to invasive intervention 1. This is not optional—it is the gold standard for assessment.

Why ICI Testing is Essential:

• Enables direct visualization of penile deformity in the erect state
• Allows assessment of plaque location and characteristics when they become apparent
• Permits evaluation of pain during erection
• When combined with duplex ultrasound, provides measurements of plaque size, density, and calcification
• Assesses vascular integrity and erectile function simultaneously 1

Imaging Modalities in Order of Utility

1. Ultrasound (First-Line Imaging)

• Detection rate: Identifies 55.9% of plaques overall, but 61.1% of palpable plaques 2
• Best for: Detecting calcifications (100% detection rate for calcified plaques) 2, 3, 4
• Advantages: Safe, non-invasive, repeatable, cost-effective 4
• Technique: Use 7.5 MHz transducer with density profile analysis 2, 3

2. Color Doppler Ultrasound (CDU)

• Identifies hyperperfusion around plaques indicating active inflammation 4
• Assesses underlying vasculogenic erectile dysfunction 5
• Should be performed during pharmacologically-induced erection

3. MRI (Reserved for Special Cases)

• Superior for: Detecting plaques at the penile base (identifies 8 additional non-palpable plaques at penile basis) 2
• Unique capability: Shows periplaque inflammation with gadolinium contrast (9% of patients show enhancement) 2, 3
• Limitations: Cannot detect calcifications, expensive 2, 3, 4
• Indications: Plaques at penile base, suspicion of malignancy, prior penile surgery 4

Important caveat: MRI showed contrast enhancement indicating inflammation in patients who did NOT report penile pain, suggesting inflammation may be present even without symptoms 2.

Clinical Algorithm for Hard-Flaccid Examination

1. Detailed history focusing on:

   • Onset, duration, progression of symptoms
   • Penile pain with/without erection
   • Interference with intercourse
   • Psychological distress 1

2. Flaccid examination with stretching and palpation

   • Expect negative findings in many cases
   • Document any palpable abnormalities

3. Proceed to ICI testing (mandatory before any invasive treatment)

   • Assess curvature, deformity, plaque characteristics in erect state
   • Consider adding duplex Doppler ultrasound

4. Ultrasound imaging (standard approach)

   • Identifies calcifications and most plaques
   • Cost-effective and readily available

5. Consider MRI only if:

   • Suspected penile base involvement
   • Need to assess active inflammation
   • Prior surgery or atypical presentation 4

The bottom line: Don't rely on flaccid examination alone—the absence of palpable findings does NOT exclude Peyronie's disease, and induced erection assessment is the diagnostic standard.