August 1977

Picture of the Month

Author Affiliations

From the Departments of Surgery and Pediatrics, University of Virginia Medical Center, Charlottesville.

Am J Dis Child. 1977;131(8):921-922. doi:10.1001/archpedi.1977.02120210099020

Denouement and Discussion 

Perineal Groove 

Manifestations  A perineal groove is a sulcus lined with mucous membrane, extending from the posterior vaginal fourchette to the anterior border of an anus located anterior to its normal position. This uncommon anomaly probably results from a defect in embryogenesis of the inner genital fold. It is classified as Z-32 in the miscellaneous group in the Proposed International Classification of Anorectal Anomalies. Stephens and Smith1 have described three major features common to this group: normal formation of the vestibule, including urethra and vagina in its anterior two-thirds; hypertrophic minoral tails that skirt the perineum and course posteriorly to join the anus or surround it; and a wet groove in the perineum between the fourchette and anus. The groove varies in size and width. The anus is usually of normal caliber; the anterior wall, which is in continuity with the wet mucosal lining of the groove, may

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