Antrochoanal polyps in children: CT findings and differential diagnosis

Antrochoanal polyp (Killian polyp) is an infrequent, usually solitary, beni gn, slowly growing lesion that arises from the maxillary antrum and reaches the choana. These polyps have a discrete male predominance and are diagnos ed usually between the third and the fifth decades of life. This report is based on three cases of antrochoanal polyp, ocurring in the pediatric group , and the objective is to demonstrate their different CT characteristics, p rincipal differential diagnoses, and potential complications. We emphasize that in all three cases of our series the growth of the polyp to the choana is through the accessory ostium.