Prenatal ultrasound and magnetic resonance images of anal atresia with rectovaginal fistula

(A) Ultrasound. Coronal view of the abdomen at 22 weeks of gestation shows the fluid-filled rectosigmoid colon containing intraluminal calcifications.
(B and C) Magnetic resonance imaging. Coronal and sagittal T2w images of the fetal abdomen confirm the presence of fluid within the distal rectosigmoid coursing posterior and inferior to the bladder base.