MR Findings of Congenital Anorectal Malformation

ABSTRACT

PURPOSE: To assess the usefulness of MRI in preoperative diagnosis of congenital anorectal malformation MATERIALS AND METHODS: MR findings of 11 cases with surgically proved anorectal malformations were retrospectively reviewed and compared with operative findings, according to the level of atresia, the development of sphincter muscle, fistula and associated anomalies of other organs. RESULTS: Four of 11 cases were low type of anorectal atresia, 3 cases were intermediate type, and 3 cases were high type. There was one case of Currarino triad with low type of anorectal stenosis. MRI demonstrated the levels of atresia correctly in all cases and revealed fistulas in all high type of anomalies. Degrees of the development of the sphincter muscles were good in all cases of low types and fair in a case of intermediate type and an anorectal stenosis, whereas the development was poor in 2 cases of intermediate type and all 4 cases of high type. The associated anomalies in anorectal malformation were renal agenesis, congenital hip dysplasia and sacral defect with presacral teratoma in Currarino triad. CONCLUSION: MRI was a simple and useful study to confirm the level of atresia, fistula and associated anomalies in the diagnosis of the congenital anorectal malformation.