Acute urinary retention in an adolescent as the presenting symptom of lichen sclerosus et atrophicus

Background: A rare case of acute urinary retention caused by labial fusion in an adolescent is described and the possible causes are discussed.

Case: A 17-year-old girl, not sexually active, presented to our emergency service for acute urinary retention. Genital examination revealed labia minora fusion from the clitoris to the vaginal fourchette; urethra, and clitoris were not visualized. Sexual abuse and trauma were excluded. The labia minora were manually separated in the operating room revealing a normal vagina and urethral meatus. Skin biopsies taken from the fused labia minora revealed Lichen Sclerosus et Atrophicus.

Summary and conclusion: Urinary retention may be seen in the face of complete adhesion of the labia minora, a rare event in postpubertal individuals. In such cases, a suspicion of underlying pathology such as asymptomatic Lichen Sclerosus should be raised and be confirmed by a biopsy.