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Fig. 5D —Anal sphincter defects shown in four patients. Axial linear
transperineal image obtained in 34-year-old woman with first-degree tear after
obstetric delivery shows anovaginal air-containing fistula as echogenic
air-containing tract running directly anterior from anal canal to vagina.
There is large anterior full-thickness defect in anal sphincter from 10- to
2-o'clock positions.
