Combined overview of common penile pathologies — foreskin disorders, abnormal erection, and fibrotic plaque.
Also known as: phimosis, paraphimosis, priapism, Peyronie disease, Peyronie's disease
Overview
Phimosis: inability to retract the foreskin over the glans (physiologic in young boys; pathologic when persistent or symptomatic). Paraphimosis: foreskin retracted behind the glans and unable to be returned, leading to constriction and edema — a urologic emergency. Priapism: prolonged penile erection (>4 hours) unrelated to sexual stimulation; ischemic (low-flow, painful, an emergency) or non-ischemic (high-flow, traumatic). Peyronie disease: acquired fibrotic plaque of the tunica albuginea producing penile curvature and pain with erection.
Epidemiology
Physiologic phimosis is normal in infants; resolves in 90% by age 3 and 99% by age 17. Paraphimosis incidence is uncommon but well-recognized, often iatrogenic (after catheterization). Priapism prevalence is highest in sickle cell disease (40% lifetime risk in men with SS disease). Peyronie disease affects 3-9% of adult men; peak incidence in 50s-60s.
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Question 1RenalEasy
A 4-year-old uncircumcised boy is brought to the pediatrician by his mother because she is unable to retract his foreskin to clean the glans, and he has had occasional ballooning of the foreskin during urination. He has no dysuria, fever, or penile discharge, and his urinary stream is otherwise strong. On examination the foreskin is soft and non-erythematous but cannot be retracted past the coronal sulcus, and the meatus is not visible. There is no induration or scarring. Which of the following is the most likely diagnosis?
AHypospadias
BPathologic phimosis from balanitis xerotica obliterans
CMeatal stenosis
DParaphimosis
EPhysiologic phimosis
Reveal answer & full explanation
Correct answer: E — Physiologic phimosis
AHypospadias
BPathologic phimosis from balanitis xerotica obliterans
CMeatal stenosis
DParaphimosis
EPhysiologic phimosis✓
Why Physiologic phimosis is correct
Physiologic phimosis is the developmentally normal inability to retract the foreskin in young uncircumcised boys due to congenital adhesions between the inner prepuce and the glans.
By age 3 about 90% of foreskins are retractable, and nearly all are retractable by adolescence.
Forcible retraction is contraindicated because it causes scarring and converts a physiologic to a pathologic phimosis.
Mild ballooning during voiding is common and not concerning when the stream is otherwise normal.
Management is reassurance, gentle hygiene, and, if persistent or symptomatic, topical betamethasone 0.05% applied to the preputial ring for 4-8 weeks.
Why the others are wrong
Pathologic phimosis from balanitis xerotica obliterans — Pathologic phimosis from balanitis xerotica obliterans (lichen sclerosus) shows a whitish, sclerotic, scarred preputial ring and may require circumcision; this child has a soft, non-scarred foreskin.
Paraphimosis — Paraphimosis is a urologic emergency in which a retracted foreskin cannot be reduced and forms a constricting band proximal to the glans, causing painful glanular edema.
Hypospadias — Hypospadias is a congenital ventral displacement of the urethral meatus, typically associated with a dorsal hooded foreskin and chordee, and is identified at birth.
Meatal stenosis — the hidden meatus and the ballooning suggest a narrowed urinary outlet, but meatal stenosis occurs mainly in circumcised boys, whose exposed meatus is irritated by diapers, and causes a narrow, upward-deflected stream; this boy is uncircumcised, his stream is not described as thin or deflected, and the ballooning places the narrowing at the preputial opening, not the meatus.
Question 2RenalEasy
A 58-year-old man presents with a 4-month history of painful curvature of his penis during erections. He reports difficulty with intercourse due to a 30-degree dorsal bend. On exam, a firm, nontender plaque is palpable on the dorsal shaft. He is otherwise healthy and sexually active with his wife. Which of the following is the most appropriate initial management?
AObservation and reassurance
BOral vitamin E supplementation
CIntralesional corticosteroid injection
DPenile prosthesis implantation
ESurgical plaque excision with grafting
Reveal answer & full explanation
Correct answer: A — Observation and reassurance
AObservation and reassurance✓
BOral vitamin E supplementation
CIntralesional corticosteroid injection
DPenile prosthesis implantation
ESurgical plaque excision with grafting
Why Observation and reassurance is correct
Peyronie disease has two phases: an active inflammatory phase (typically 6–18 months) with pain and progressive deformity, followed by a stable phase with established, fixed curvature.
In the active phase with mild-to-moderate curvature where intercourse is still possible, observation and reassurance is first-line, as a subset of cases resolve or improve spontaneously and pain typically subsides over time.
This patient is in the active phase (4 months of painful erections) with a moderate 30-degree bend; although intercourse is difficult, procedural correction (collagenase injection or surgery) is deferred until the disease stabilizes, making observation the appropriate initial choice.
Oral therapies do not correct the deformity: the AUA advises against vitamin E, tamoxifen, procarbazine, and omega-3 fatty acids because efficacy is not supported by evidence, and evidence for oral pentoxifylline is insufficient to recommend it.
Once pain has resolved and the curvature has stopped changing, urology can offer stable-phase options if the deformity still compromises intercourse.
Why the others are wrong
Oral vitamin E supplementation — ineffective-therapy trap: once widely used for Peyronie disease, but controlled trials show no benefit over placebo for curvature, plaque size, or pain, and the AUA recommends against it.
Penile prosthesis implantation — confused-with the ED indication: appropriate only when Peyronie disease coexists with erectile dysfunction refractory to medical therapy, which this patient does not have.
Surgical plaque excision with grafting — right-concept-wrong-setting: reserved for stable disease (>12 months) with severe, fixed curvature preventing intercourse, not for an active-phase patient still able to have intercourse.
Intralesional corticosteroid injection — anti-inflammatory-reasoning trap: the active phase is inflammatory, so injecting a steroid into the plaque seems logical, but a placebo-controlled trial showed no meaningful reduction in curvature, plaque size, or pain, and injections can cause local tissue atrophy; it is not a recommended Peyronie therapy.
Additional high-yield points
Intralesional collagenase clostridium histolyticum is indicated for the STABLE phase with qualifying dorsal/lateral curvature (roughly 30–90 degrees) and intact rigidity — NOT for the active inflammatory phase.
The palpable dorsal plaque represents fibrosis of the tunica albuginea; dorsal plaques classically produce dorsal curvature.
Peyronie disease is associated with Dupuytren contracture, diabetes, and prior penile trauma.
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Peyronie: connective tissue disease (Dupuytren contracture in ~20%), penile trauma during intercourse, diabetes, hypogonadism, age >50
Pathophysiology
Phimosis can be physiologic (developmental) or pathologic (scarring of the foreskin). Paraphimosis: retracted foreskin acts as a tourniquet, causing venous and lymphatic obstruction, edema, and ultimately arterial compromise and glans necrosis. Priapism: ischemic priapism results from failure of detumescence with venous outflow obstruction and corporal acidosis/ischemia (compartment syndrome of the penis). Non-ischemic priapism from arterial-cavernous fistula is high-flow and non-painful. Peyronie disease: trauma-induced inflammation of the tunica albuginea progresses to fibrotic plaque with curvature.
Clinical presentation
Symptoms
Phimosis: inability to retract foreskin; dysuria, ballooning during urination, recurrent infections
Paraphimosis: sudden severe pain, swollen edematous glans with constricting band of retracted foreskin proximally
Priapism: prolonged erection (>4 h); painful and rigid in ischemic, less painful and partially rigid in non-ischemic; history of sickle cell, intracavernosal injection, PDE5 use
Peyronie: gradual onset of penile curvature with erection, palpable plaque (often dorsal), pain with erection (early/active phase), erectile dysfunction (late)
Signs / physical exam
Phimosis: non-retractable foreskin; scarring may be visible at the preputial ring
Paraphimosis: tender, edematous glans, distal to a fixed proximal constricting ring of foreskin
Priapism: rigid corpora cavernosa (corpus spongiosum/glans typically soft); doppler shows absent or low cavernous artery flow in ischemic
Peyronie: palpable plaque on tunica albuginea; curvature with erection (often photographed by patient for documentation)
Differential diagnosis
Balanitis / balanoposthitis — Inflammation/infection of glans (and foreskin); erythema, discharge; common in poorly retracting foreskins and diabetes
Penile cancer (especially SCC) — Persistent ulcer, mass, induration under the foreskin; HPV-related or chronic inflammation; biopsy
Peyronie vs congenital curvature — Peyronie has palpable plaque, pain in early phase, adult onset; congenital curvature lifelong without plaque
Priapism: ischemic vs non-ischemic — Ischemic = painful, rigid corpora, dark/acidic aspirated blood, requires emergent decompression. Non-ischemic = painless, partially rigid, bright red aspirate, usually after perineal trauma
Diagnostic workup
Diagnostic criteria
Clinical diagnosis for all; corporal blood gas and duplex ultrasound guide priapism subtyping.
Labs
Priapism: hemoglobin/sickle screen in any black patient or unknown sickle status; CBC, reticulocyte count; toxicology if substance use suspected; corporal blood gas — ischemic priapism shows pH <7.25, pO2 <30, pCO2 >60
Peyronie: testosterone, glucose (associations with hypogonadism, diabetes)
Imaging
Priapism: penile duplex ultrasound differentiates ischemic (low flow) from non-ischemic (high flow with cavernous artery fistula)
Peyronie: penile duplex ultrasound after intracavernosal injection to characterize plaque and curvature
Diagnostic algorithm
Condition
Key Feature
First-Line Management
Phimosis (physiologic)
Non-retractable foreskin without scarring; can be normal into adolescence
Observation; topical steroid if symptomatic
Paraphimosis
Retracted foreskin trapped behind glans, painful
Emergent manual reduction; dorsal slit if needed
Ischemic priapism
Painful rigid erection >4 h, dark aspirate
Aspiration + intracavernosal phenylephrine; shunt if refractory
Non-ischemic priapism
Painless partial erection after perineal trauma
Observation; selective arterial embolization if needed
Peyronie disease (active)
New or changing curvature + pain + plaque
NSAIDs for pain; await stabilization (intralesional verapamil or interferon optional)
Peyronie disease (stable)
Curvature unchanged >=3 mo, pain resolved
Intralesional collagenase (30-90 degrees, intact erections); surgery (plication or grafting); prosthesis if ED
Summary of common penile pathologies and their first-line management.
Treatment
First-line
Phimosis: physiologic phimosis needs only observation; if symptomatic (recurrent balanitis, UTI, painful erections), topical corticosteroid (e.g., betamethasone 0.05%) twice daily for 4-8 weeks resolves up to 80%; pathologic phimosis from BXO/lichen sclerosus is treated with an ultrapotent steroid (clobetasol propionate 0.05%); circumcision or preputioplasty if refractory (circumcision with histology in BXO)
Paraphimosis: emergent manual reduction after analgesia/local anesthetic; gentle compression of edematous glans (sometimes with sugar wrap or ice), then thumb pressure on glans with traction on foreskin to return foreskin distally; if unsuccessful, dorsal slit incision and urology consultation; definitive circumcision often performed once edema resolves
Ischemic priapism (>4 h): emergent intracavernosal aspiration of stagnant blood +/- irrigation with cold saline; intracavernosal phenylephrine 100-500 mcg every 3-5 min (max 1 mg/h) — monitor BP and HR; in sickle cell disease, do not delay this local treatment for systemic measures (analgesia, IV fluids if dehydrated, oxygen if hypoxic), which may be given concurrently, and do not use exchange transfusion as primary therapy
If priapism persists >24-36 h or refractory to aspiration/phenylephrine: surgical shunting (Winter, Ebbehoj, T-shunt, or Al-Ghorab); penile prosthesis consideration in delayed presentations
Non-ischemic priapism: usually self-limited; observation; selective arterial embolization if persistent
Peyronie active phase (pain, changing curvature): oral NSAIDs for pain; traction therapy, pentoxifylline, or a PDE5 inhibitor (limited evidence); intralesional verapamil or interferon may be offered; defer collagenase and surgery until the disease is stable
Peyronie stable phase (symptoms unchanged for >=3 months): intralesional collagenase Clostridium histolyticum (Xiaflex) with modeling for curvature 30-90 degrees with intact erections; surgical correction (plication, plaque incision/excision with grafting, or penile prosthesis if concurrent severe ED) for severe or refractory deformity
Second-line / adjunct
Phimosis: routine neonatal circumcision is a separate, culturally/individually based decision; not required for physiologic phimosis
Paraphimosis prevention: always replace foreskin to original position after catheterization or examination
Priapism prevention in recurrent stuttering priapism (sickle cell or idiopathic): scheduled oral pseudoephedrine or terbutaline, hormonal therapy (GnRH analogs, antiandrogens) reserved for severe cases
Complications
Phimosis: recurrent balanitis, UTI, painful intercourse, increased risk of penile cancer if chronic inflammation
Paraphimosis: glans ischemia, necrosis, gangrene if not promptly reduced
Paraphimosis is a urologic emergency — manual reduction must be attempted promptly to prevent glans ischemia. Always return the foreskin after catheterization or exam.
Ischemic priapism is a compartment syndrome of the penis — must be relieved within 4-6 hours to preserve erectile function. Phenylephrine (alpha-1 selective) is the safest intracavernosal sympathomimetic.
In sickle cell disease, ischemic priapism gets the same immediate local treatment as in any patient (aspiration/irrigation plus intracavernosal phenylephrine); standard sickle cell care (analgesia, IV fluids if dehydrated, oxygen if hypoxic) is given alongside but must not delay it, and exchange transfusion is not a primary treatment.
Peyronie disease: in the active phase (pain, changing curvature) treat pain with NSAIDs and wait for stabilization; once stable (unchanged for >=3 months), offer intralesional collagenase (curvature 30-90 degrees, intact erections) or surgical correction.
Persistent or scarring phimosis (especially with whitish ring of tissue) raises concern for balanitis xerotica obliterans — a vulvar/penile lichen sclerosus variant — and warrants topical steroid trial and biopsy if atypical.
References
AUA/SMSNA 2022 — Bivalacqua TJ, Allen BK, Brock G, et al. Diagnosis and Management of Priapism: AUA/SMSNA Guideline. Part 1, Acute Ischemic Priapism: J Urol 2021;206(5):1114-1121. Part 2, Recurrent Ischemic Priapism, Priapism in Sickle Cell Patients, and Non-Ischemic Priapism: J Urol 2022;208(1):43-52
AUA 2015 — AUA Guideline on Peyronie's Disease (Nehra et al., J Urol 2015)
BAD 2018 — Lewis FM, Tatnall FM, Velangi SS, et al. British Association of Dermatologists guidelines for the management of lichen sclerosus, 2018. Br J Dermatol 2018;178(4):839-853
EAU — EAU Guidelines on Sexual and Reproductive Health (Salonia et al.)
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