Megarectum after surgery for anorectal malformations

Sacral anomalies, which are more prevalent in children who developed megarectum, may result in abnormal rectal proprioception contributing to this pathology. Innervation anomalies may coexist, although preoperative manometries showed normal AIRs. Rectal dysmotility may lead to stool retention with subsequent dilatation, and patients who underwent colonic manometry had diffuse colonic hypermotility. Further physiologic and cellular studies are needed to elucidate the causes of this significant complication after surgical ARM repair in the absence of obstruction.