Peyronie Disease

Detailed Overview

The condition occurs in two phases. The acute (inflammatory) phase is characterized by penile pain (especially during erection), progressive curvature, and soft nodule formation. This phase lasts 12-18 months. The chronic (stable) phase is defined by the cessation of pain, stabilization of the curvature, and calcification of the plaque. The disease is believed to be an aberrant wound-healing response to microtrauma sustained during sexual intercourse in genetically susceptible individuals. It can severely impact a patient's psychological well-being and intimate relationships.

Epidemiology & Demographics

Prevalence is estimated at 3-9% of adult men, though it is likely underreported due to embarrassment. Most common between ages 50 and 60. Rarely occurs in men under 40.

Etiological Mechanism

The exact etiology is multifactorial, involving genetic predisposition, trauma, and aberrant tissue healing. There is a strong association with other superficial fibromatoses, particularly Dupuytren's contracture (palmar fibromatosis), which occurs in up to 20% of men with Peyronie disease.

Primary Causes

Repeated subclinical microvascular trauma to the tunica albuginea during sexual intercourse or minor pelvic trauma. This leads to extravasation of fibrinogen and trapping of fibrin, which stimulates fibroblasts and triggers an excessive fibrotic cascade.

• Genetics: HLA-B7 cross-reactivity and family history; association with Dupuytren's contracture.
• Age: Risk increases significantly after the fifth decade of life.
• Erectile Dysfunction (ED): Pre-existing ED reduces penile rigidity, making the penis more susceptible to bending injury during intercourse.
• Diabetes & Hypertension: Microvascular disease exacerbates poor tissue healing.

Trauma causes delamination of the tunica albuginea, leading to a microhematoma. Inflammatory cytokines, particularly Transforming Growth Factor-beta 1 (TGF-β1), are upregulated. TGF-β1 drives the excessive conversion of fibroblasts into myofibroblasts, which deposit dense, disorganized bundles of collagen (type I and III) and elastin. This localized plaque prevents symmetric expansion of the corpora cavernosa during an erection, causing the penis to bend toward the plaque. Eventually, the plaque may undergo dystrophic calcification.

Characteristic Clinical Presentation

• Penile Curvature: Bending of the penis during erection (dorsal, ventral, or lateral).
• Penile Pain: Aching pain present primarily during erections, typical of the acute phase.
• Palpable Plaque: Hard lump or band felt under the skin of the penis.
• Erectile Dysfunction: Inability to maintain an erection distal to the plaque, or psychogenic ED secondary to anxiety.

Physical Examination Signs

• Palpable induration over the corpora cavernosa (usually dorsal).
• Indentation, hourglass deformity, or shortening of the flaccid or erect penis.
• Curvature angle measured during induced erection.

• Severe Erectile Dysfunction: Mechanical inability to have intercourse, or vascular compromise due to veno-occlusive dysfunction.
• Psychological Distress: High rates of depression, performance anxiety, and relationship difficulties.

Diagnostic Criteria & Guidelines

Clinical diagnosis based on history (painful erections, acquired curvature) and physical examination (palpable plaque). To determine treatment, the degree of curvature must be objectively assessed, usually with photographs taken by the patient or by inducing an artificial erection in the clinic using intracavernosal injection of a vasoactive agent.

Differential Diagnosis

• Congenital Penile Curvature (no palpable plaque, present since puberty)
• Penile Thrombophlebitis (Mondor's disease of the penis)
• Penile Fracture (acute traumatic rupture of tunica albuginea)
• Syphilitic Chancre or Penile Cancer (if skin lesions are present)

Laboratory Tests & Biomarkers

• Testosterone Profile: May be normal or low (checked if concurrent systemic ED is suspected).
• No specific blood tests: Diagnosis is clinical.

Imaging Modalities & Findings

• Penile Duplex Doppler Ultrasound:

• Acute Phase
  Lasts 5-18 months. Characterized by active inflammation, painful erections, changing/worsening curvature, and uncalcified plaques.
• Chronic Phase
  Pain resolves. Deformity stabilizes (no change for ≥3 months). Plaques become dense and often calcified.

Second-Line & Adjunctive Therapy

Intralesional Interferon alfa-2b or Verapamil (off-label). Penile traction therapy (PTT) devices used daily can help preserve length and reduce curvature when combined with injections.

Surgical & Procedural Management

Indicated only in the chronic/stable phase for severe deformity preventing intercourse. Options include: 1) Tunical plication (Nesbit procedure) - sutures placed on the convex side to straighten penis (causes slight shortening). 2) Plaque incision/excision and grafting - for severe curves >60 degrees or hourglass deformities. 3) Inflatable Penile Prosthesis (IPP) placement with modeling - the gold standard if severe ED is present alongside Peyronie's.

Recommended Lifestyle Changes

Patient Counseling & Advice

Reassure the patient that the condition is benign and not related to cancer. Educate them on the natural history: pain typically resolves on its own, but the curvature usually stabilizes and rarely improves spontaneously. Emphasize that surgical options are highly effective but must wait until the disease has been stable for at least 6 months.

Follow-Up & Monitoring Schedule

Assess every 3-6 months during the acute phase to monitor progression and pain. During injection therapy, monitor for signs of corporal rupture.

Preventive Strategies

No definitive prevention. Optimizing erectile function (e.g., using PDE5 inhibitors like sildenafil if early ED is present) can prevent the buckling trauma that initiates the disease.

Spontaneous resolution of curvature occurs in less than 12% of men. With treatment (Xiaflex or surgery), over 70% achieve sufficient straightening to resume satisfactory intercourse.