Phimosis

Definition

Types

1. Physiological (Primary) Phimosis

• Present at birth in virtually all uncircumcised newborns
• Due to natural adhesions between the glans and inner preputial skin and/or a tight preputial ring
• By 3 years of age, fewer than 10% of foreskins remain non-retractile
• Nearly all resolve spontaneously by late adolescence
• Not a pathological condition - does not require treatment unless causing symptoms
• Children under 2 years rarely have true phimosis

2. Pathological (Secondary/Acquired) Phimosis

• Caused by scarring of the preputial ring from:
  • Recurrent balanoposthitis (inflammation of glans + prepuce)
  • Recurrent infections / poor hygiene
  • Forcible retraction of the foreskin (causing micro-tears and scarring)
  • Lichen Sclerosus (LS) / Balanitis Xerotica Obliterans (BXO) - foreskin becomes thickened, whitish, and forms a constricting band
  • Diabetes mellitus (chronic balanoposthitis in older diabetic men may be the initial complaint)
  • Excessive skin left after circumcision becoming stenotic

Clinical Features

• Inability to retract the foreskin
• Ballooning of the foreskin during urination (urine trapped under prepuce then dribbles after voiding)
• Edema, erythema, and tenderness of the prepuce
• Purulent discharge (in infected cases)
• Dyspareunia / painful erections (in adults)
• Rarely: acute urinary retention when the preputial orifice is nearly completely sealed - a true urologic emergency

Lichen Sclerosus (BXO) - Active Phase

Complications

• Robbins: "Phimosis is important because it interferes with cleanliness and permits the accumulation of secretions and detritus under the prepuce, favoring development of secondary infections and increasing the risk for penile carcinoma."

Management

Conservative (First-line for physiological and early pathological)

• Betamethasone 0.05-0.10% applied twice daily to the tip of the foreskin extending to the glandis corona for 4-8 weeks, combined with daily gentle manual preputial retraction
• Success rate: ~84-87% (Palmer & Palmer 2008)
• Response may be visible within 2 weeks
• Failure (~15%) is associated with increased collagen density and decreased elastin in the prepuce histologically
• A 2024 Cochrane systematic review (PMID 38269441) confirms topical corticosteroids are safe and effective for phimosis in boys, with moderate-quality evidence
• Acquired phimosis (secondary to scarring/BXO) is often refractory to topical steroids

Emergency / Temporizing

• Hemostatic dilation of the preputial ostium - temporarily relieves acute urinary retention
• Dorsal slit under local anesthesia - when catheterization is required urgently

Surgical (Definitive)

• Indications: persistent/symptomatic phimosis, secondary phimosis, recurrent balanoposthitis, BXO, UTIs, topical steroid failure, paraphimosis, penile carcinoma risk
• Should be deferred in children requiring general anesthesia unless there are recurrent infections
• Should be performed after any active infection is controlled (treat first with broad-spectrum antibiotics)
• AAP (2012): benefits of circumcision (reduced UTI risk, reduced HIV and STI transmission) are sufficient to warrant access and third-party payment for neonatal circumcision, though not recommended routinely for all newborns

Paraphimosis (Related Emergency)

1. Compress the glans firmly for 5 minutes (or wrap with 2-inch elastic bandage x 5 min) to reduce edema
2. EMLA cream (2.5% lidocaine + 2.5% prilocaine) for analgesia
3. Manual reduction: thumbs on glans pushing proximally, fingers on foreskin pulling distally
4. If unsuccessful: dorsal penile nerve block + superficial dorsal slit of the constricting band under local anesthesia (1% lidocaine without epinephrine)
5. Circumcision once inflammation subsides

Key Points Summary