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 1ReproductiveEasy
A 68-year-old uncircumcised man is brought to the emergency department with sudden, severe penile pain that began an hour ago. He had a urinary catheter placed earlier in the day for acute urinary retention, and the foreskin was retracted during the procedure. On examination, the glans is markedly swollen, tender, and edematous, with a firm constricting ring of retracted foreskin lodged proximal to the corona. The shaft proximal to the ring appears normal, and there is no plaque or curvature. Which of the following is the most likely diagnosis?
ABalanoposthitis
BPriapism
CParaphimosis
DPhimosis
Reveal answer & full explanation
Correct answer: C — Paraphimosis
ABalanoposthitis
BPriapism
CParaphimosis✓
DPhimosis
Why Paraphimosis is correct
A retracted foreskin that cannot be returned over the glans acts as a tourniquet, producing venous and lymphatic obstruction with the classic painful, swollen, edematous glans and a constricting proximal ring — exactly this picture.
It is frequently iatrogenic, occurring when the foreskin is retracted for catheterization or examination and not replaced, as happened here.
Paraphimosis is a urologic emergency: emergent manual reduction after analgesia must be attempted promptly to prevent glans ischemia and necrosis; a dorsal slit is performed if reduction fails.
Why the others are wrong
Phimosis — inability to retract the foreskin over the glans (the opposite mechanical problem); it presents with ballooning during urination or recurrent infections, not an acutely entrapped, edematous glans distal to a constricting ring.
Priapism — a prolonged (>4 h), painful, rigid erection from failed detumescence (ischemic, low-flow type); the corpora cavernosa are rigid and there is no retracted constricting foreskin band or isolated glans edema.
Balanoposthitis — inflammation of the glans and foreskin from candidal or bacterial infection or poor hygiene, producing erythema, subpreputial discharge, and soreness developing over days; it lacks the abrupt onset and the firm constricting ring of retracted foreskin proximal to the corona seen here.
Question 2ReproductiveMedium
A 24-year-old uncircumcised man presents to the emergency department with 3 hours of severe penile pain and swelling that began after sexual activity. On examination, the glans is markedly edematous and tender, with a tight band of retracted foreskin sitting proximal to the corona. The penile shaft proximal to the band is soft and nontender, and the corpora cavernosa are not rigid. A diagnosis of paraphimosis is made. Which of the following best explains the findings?
AImmediate hypersensitivity reaction producing acute angioedema of the glans
BConstricting foreskin obstructing venous and lymphatic outflow from the glans
CFibrotic plaque of the tunica albuginea restricting expansion of the corpora
DBacterial infection of the glans and prepuce causing inflammatory swelling
Reveal answer & full explanation
Correct answer: B — Constricting foreskin obstructing venous and lymphatic outflow from the glans
AImmediate hypersensitivity reaction producing acute angioedema of the glans
BConstricting foreskin obstructing venous and lymphatic outflow from the glans✓
CFibrotic plaque of the tunica albuginea restricting expansion of the corpora
DBacterial infection of the glans and prepuce causing inflammatory swelling
Why Constricting foreskin obstructing venous and lymphatic outflow from the glans is correct
In paraphimosis the foreskin is retracted behind the glans and cannot be returned; the tight preputial ring acts as a tourniquet around the distal shaft.
This first obstructs venous and lymphatic outflow, producing progressive glans edema, which worsens the constriction; if unrelieved it eventually compromises arterial inflow and leads to glans ischemia and necrosis.
The findings fit: edema and pain are confined to the glans distal to the band, while the proximal soft shaft and nonrigid corpora exclude a corporal process.
Why the others are wrong
Immediate hypersensitivity reaction producing acute angioedema of the glans — angioedema swells the prepuce and shaft diffusely and is usually pruritic with an identifiable exposure or urticaria, rather than producing edema sharply confined distal to a retracted preputial band.
Bacterial infection of the glans and prepuce causing inflammatory swelling — balanoposthitis evolves over days with erythema, malodorous or purulent subpreputial discharge, and often fever, not over 3 hours in a foreskin mechanically trapped behind the corona.
Fibrotic plaque of the tunica albuginea restricting expansion of the corpora — the mechanism of Peyronie disease, which causes gradual painful curvature with a palpable plaque, not acute glans edema behind a retracted foreskin.
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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, child <3-5 yr
Observation; topical steroid if persistent/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 curvature + pain + plaque
Pain control; intralesional collagenase/verapamil
Peyronie disease (stable)
Stable curvature, no pain, >12 mo
Surgical correction (plication or grafting); prosthesis if ED
Summary of common penile pathologies and their first-line management.
Treatment
First-line
Phimosis: in symptomatic boys >3 yr or with pathologic phimosis (BXO/lichen sclerosus), topical mid-potency corticosteroid (e.g., betamethasone 0.05%) twice daily for 4-8 weeks resolves up to 80%; circumcision or preputioplasty if refractory
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; for sickle cell, simultaneously initiate IV hydration, analgesia, oxygen, and exchange transfusion as needed
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 (within 12 mo, pain present): pain control, oral pentoxifylline or PDE5 inhibitor (limited evidence), intralesional collagenase Clostridium histolyticum (Xiaflex) or verapamil/interferon for stable curvature with palpable plaque without calcification
Peyronie stable phase (>12 mo): surgical correction — plication, plaque incision/excision with grafting, or penile prosthesis if concurrent severe ED
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.
All sickle cell patients with priapism need hydration, oxygen, analgesia, and potential exchange transfusion in ADDITION to local penile management.
Peyronie disease is treated medically (intralesional collagenase, traction therapy) in the active phase and surgically once stable (>12 months).
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 2021 — AUA Guideline on the Diagnosis and Management of Priapism (Bivalacqua et al., J Urol 2022)
AUA 2015 — AUA Guideline on Peyronie's Disease (Nehra et al., J Urol 2015)
AAP — AAP Task Force on Circumcision Policy Statement (Pediatrics 2012, reaffirmed)
EAU — EAU Guidelines on Sexual and Reproductive Health (Salonia et al.)
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