A neonate is brought with history of not having passed meconium. On examination there is no anal opening but a dimple. Investigation of choice would be?
MRI, due to excellent inherent soft tissue contrast,is best to define the relationship of the atretic segment to the levator ani pelvic sling and the integrity of sphincters and their nerve supply (anorectal malformation).
X-ray in erect posture
MRI study
CT Gastrograffin study
Inveogram
Gastrointestinal Radiology