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[Does MRI compared with ultrasound examination add therapy-relevant knowledge in anorectal abnormalities?].

The topographical situation of the blind end of the recto-anal atresia to the musculus levator ani is the main question to ask when deciding on any operative procedure and for the prognosis of continence. In neonates, the use of preoperative perineal ultrasound is sufficient rather than magnetic resonance imaging in establishing the surgical way. In older incontinent children after pullthrough procedure, magnetic resonance imaging has benefits over endorectal ultrasound, especially in presenting muscular and cicatricial relationships.