Significance of vaginal air on computed tomography.

The CT examinations of the pelvis in 200 females were reviewed to assess the frequency and significance of finding air in the vagina. Small amounts of air seen on only one section without distention of the vagina were common, occurring in 11% of our patients. Distention of the vagina with air and visualization on more than one image was found only with enterovaginal fistula and in those patients studied with a tampon in place. These two entities are easily distinguished by the symmetry of the latter.