We describe a new sonographic sign for the detection of anal atresia in the early midtrimester on transvaginal sonography. In six cases of fetal anal atresia, the finding of a transient, distended, and right-sided sigmoid colon was observed at 13–16 weeks' gestation. Three cases have undergone pregnancy termination due to multiple anomalies. In the other three, the colonic distension resolved by 19 weeks' gestation. In two of these, the finding was isolated, and no other anomalies were detected. In all six cases, anal atresia or cloaca was confirmed on postabortal autopsy or after delivery.
Bibliographical notePublisher Copyright:
© 2016 Wiley Periodicals, Inc.
- anal atresia
- fetal malformations
- fetal sonography
- prenatal diagnosis
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging