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Background and Objectives:Antrochoanal polyp (ACP) is defined as a polyp that originates in the maxillary sinus and pases through the sinus ostia. Physical examination and radiologic findings are the two most important aspects in the diagnosis authors reviewed the preoperative OMU CT findings of ACPS. Materials and Method:A total of 21 patients without the history of any previous nasal operations were entered into the study. The following seven radiologic parameters were reviewed: presence of polyp, origin of ACP, identification of accesory ostium, destruction in the OMU area, bony changes of the medial maxillary sinus wall, shapes of ACP that extended into nasopharynx in relation with sinusitis. Results:ACPs were classified changes only in 2 patients and bony changes of the medial wall in 17 patients. Lobulated contour in shape was observed in 24% of the patients. Conclusion:ACP is originated in the maxillary sinus and it grows into the nasal cavity via the posterior fonta-nelle area. It may regress due to insuficient blood suply, but its shape is retained. (Korean J Otolaryngol 2003 ;46 :54-8)