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Also known as
Dorsal nerve neuropathy, Pudendal nerve neuropathy (penile branch), Penile sensory neuropathy, Neurogenic erectile dysfunction, Peripheral neuropathy affecting the penis
Definition
Penile neuropathy is a neurological condition characterized by damage or dysfunction of the nerves that supply the penis, particularly the dorsal nerve of the penis (a sensory branch of the pudendal nerve).1 This pathology affects both large diameter, myelinated neurons (responsible for pressure, touch, and vibration sensation) and small diameter axons (responsible for hot and cold thermal sensation).2 The nerve damage disrupts normal sensory pathways and autonomic function, leading to altered penile sensation and erectile dysfunction.3
Electrophysiological recordings help guide the diagnosis by measuring the reduction of sensory velocity of the dorsal nerve of the penis.1 Multiple etiologies can be found, including traumatic, toxic, and compressive factors, but the most common cause is neuropathy related to diabetes mellitus.1,4 Sexual disorders, including deterioration of erection and sensory signs (hypoesthesia or paresthesia of the penis), are commonly noted in patients with penile neuropathy.1
Studies have demonstrated that sensation of the glans penis is significantly diminished in patients with erectile dysfunction compared to those without, and these differences remain significant when controlling for age, diabetes, and hypertension.2 The sensory threshold methods used to assess penile neuropathy represent non-invasive and relatively simple procedures that can be used in a longitudinal fashion to assess a patient’s neurological response to therapies.2
Clinical Context
Penile neuropathy is clinically significant as a common cause of erectile dysfunction (ED), particularly in patients with diabetes mellitus.1 The condition is diagnosed through comprehensive neurophysiological assessment, including sensory threshold testing for vibration, pressure, spatial perception, and thermal sensitivity.2
Patient selection for treatment depends on the severity of symptoms, underlying causes, and response to first-line therapies. For mild cases with identifiable causes, addressing the underlying condition (such as improved glycemic control in diabetic patients) may improve symptoms.4 First-line treatments typically include phosphodiesterase type 5 (PDE5) inhibitors, though their efficacy may be reduced in neurogenic ED compared to other etiologies.4
For patients who do not respond to oral medications, second-line treatments include intracavernosal or intraurethral vasoactive agents and vacuum erection devices (VED).4 In severe cases of ED resulting from penile neuropathy that do not respond to less invasive treatments, surgical implantation of penile prostheses may be considered.4
The expected outcomes vary based on the underlying cause, severity, and chosen treatment approach. Research has shown that the prevalence of peripheral neuropathy in men with erectile dysfunction is significantly higher than in those without ED, with one study finding a robust association of erectile dysfunction with peripheral neuropathy in US men ≥40 years of age.3 This association was pronounced in the absence of diabetes and persisted after adjusting for traditional risk factors.3
Disease-related factors such as depression, decreased physical and mental function, the burden of chronic illness, and loss of independence may preclude sexual intimacy and lead to ED as well.4 The amount of data regarding treatment options in subpopulations of differing neurologic disorders remains scarce except for men with spinal cord injury.4