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Emergency And Acute Medicine – Phimosis
Phimosis is the inability to retract the foreskin (prepuce) over the glans penis. True (pathologic) phimosis results from scarring and fibrosis of the preputial opening, preventing retraction. It is important to distinguish this from physiologic phimosis, which is normal in young children due to natural adhesions between the glans and the inner prepuce. At birth, the foreskin is rarely retractable. Approximately 90% of foreskins are retractable by age 3 years and 99% by age 17, as smegma-producing epithelial cells shed and adhesions separate naturally. Parents should be instructed never to forcibly retract a child’s foreskin, as this may cause trauma and scarring.
True phimosis may develop from trauma due to forcible retraction, recurrent diaper dermatitis, repeated episodes of balanoposthitis (inflammation of the glans and foreskin), poor hygiene, poorly performed circumcision, or congenital anomalies. Chronic inflammation leads to fibrosis and narrowing of the preputial opening.
Patients may present with dysuria, hematuria, poor urinary stream, or ballooning of the foreskin during urination in severe cases. Examination may reveal a whitish, narrowed preputial orifice, along with edema, erythema, and tenderness of the foreskin. Associated balanoposthitis may be present. In extreme cases, obstructive uropathy or vascular compromise of the glans can occur, though these are uncommon.
In most cases, no laboratory or imaging workup is necessary. If severe stenosis causes suspected obstructive uropathy, evaluation of kidney function with BUN and creatinine and renal ultrasonography should be performed. When phimosis occurs secondary to recurrent balanoposthitis, screening for diabetes mellitus with urinalysis, serum glucose, or hemoglobin A1C is appropriate.
The main differential diagnosis is physiologic preputial adhesions in young children, which are normal and do not require intervention. Balanoposthitis without true phimosis should also be considered.
Pre-hospital personnel and caregivers should not attempt to retract the foreskin before medical evaluation, as this may worsen scarring or precipitate the more urgent condition of paraphimosis. Most patients require no immediate stabilization.
If obstructive uropathy is present, bladder decompression with urethral catheterization or suprapubic aspiration may be required. If vascular compromise of the glans occurs, an urgent dorsal slit procedure is necessary after adequate anesthesia, although this situation is rare in phimosis. Topical corticosteroids are often effective and represent first-line therapy. Betamethasone dipropionate 0.05–0.1% applied to the preputial orifice twice daily for 4–6 weeks has a high success rate in reducing phimosis. In pediatric patients requiring foreskin incision, procedural sedation is typically preferred over penile block.
Admission is indicated for obstructive uropathy or severe balanoposthitis with ischemia or necrosis. Patients who can void normally and have reliable urologic follow-up may be discharged. Referral to urology is recommended for evaluation of response to steroid therapy, possible dilation, operative repair, or elective circumcision if needed.
Physiologic phimosis should be managed with reassurance, age-appropriate expectations, and proper hygiene. Forced retraction should be avoided in children, especially between ages 3 and 17, when nonretractability may still be normal. Any signs of vascular compromise of the glans require urgent intervention to prevent necrosis.
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