Classification of Antrochoanal Polyp according to the Extension / 대한이비인후과학회지

ABSTRACT

BACKGROUND AND OBJECTIVES: Recently, there have been many reports of antrochoanal polyp (ACP), but the classification of ACP according to the extension of ACP is not yet available. Little is known about what effects the extention of ACP has on the nasal structure. So, in this article, we classified ACP according to the extension of ACP (Type I-extend to nasal cavity, Type II-to nasopharynx, Type III-to oropharynx). SUBJECTS AND METHOD: There were 29 patients who were diagnosed as ACP at the Daejin Medical Center (DMC) recently. There were 4 cases of type I, 20 cases of type II, and 5 cases of type III ACPs. We assessed the clinical, radiological, image-related, and surgical aspects according to the type. The clinical symptom, average symptom duration and surgical aspect were examined using the medical and surgical record. Radiological and image-related feature were analyzed by using CT, navigation software. RESULTS: Nasal obstruction was the most common symptom and the average symptom duration of each type was 18.5 months for type I, 31.1 months for type II, and 32.3 months for type III, repectively. The average fontanelle size of affected maxillary sinus (MS) was larger than that of non-affected side. The volume of affected MS was smaller than that of non-affected side. There was no difference between non-affected and affected MS in the 3-D image at each ACP type. CONCLUSION: We classified ACPs based on the extension of ACP. According to the ACP extension, CT findings were changed but 3-D image and volume of MS were not affected.