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| Fig. 3: At the level of the choana, it is lobulated and crosses the midline, hangning into the oropharynx. |
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| Fig. 4: "Antrochoanal polyp (Killian polyp) is an infrequent, usually solitary, benign, slowly growing lesion that arises from the maxillary antrum and reaches the choana. These polyps have a discrete male predominance and are diagnosed usually between the third and the fifth decades of life. This report is based on three cases of antrochoanal polyp, occurring in the pediatric group, and the objective is to demonstrate their different CT characteristics, principal 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." - Pruna X, et al. Antrochoanal polyps in children: CT findings and differential diagnosis. Eur Radiol 2000;10(5):849-51
"The antrochoanal polyp is a particular pathology of nasal fossae and sinuses. Since the first description made by Killian, several pathogenic mechanisms and surgical techniques have been reported." - Raji A, et al.Acta The antrochoanal polyp. Otorhinolaryngol Belg 2000;54(4):473-8
"[Antrochoanal polyps] did not show morphological features typical of allergy-associated (eosinophilic) polyps. Conclusions: In spite of minor differences, antrochoanal polyps can be regarded as chronic inflammation-associated polyps with cystic origin and peculiar localization." - Litwin JA, et al. Morphological and clinical characteristics of antrochoanal polyps: comparison with chronic inflammation-associated polyps of the maxillary sinus. Auris Nasus Larynx 2001 Apr;28(2):137-141
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14 Y/O MALE W/ STUFFINESS
