title: [Clinical observation on the origin of antrochoanal polyp].
abstract: OBJECTIVE
  To explore the origin and etiopathogenesis of antrochoanal polyp (ACP) based on the clinical data.
  
  
  METHODS
  Twenty-six patients with ACP were included in the study. All the ACP patients were documented by preoperative endoscopy and computer tomographic (CT) scans. All patients were treated under endonasal endoscopic surgery. The relationship between polyp in middle meatus and lesions in the antrum was observed during the surgery. Following surgical removal, the polyps and lesions in the antrum were studied under macroscopy and microscopy.
  
  
  RESULTS
  Among 26 cases with ACP, 17 cases were confirmed by preoperative endoscopic examination that polyp originating from antrum ostium, 19 cases showed intimate relationship between the polyp and antrum lesions in CT scan, and 23 cases were found that the polyp originating from the antrum cyst. The pedicle of polyp connected the cyst through autrum ostium, and the polyp existed as a part of capsule wall.
  
  
  CONCLUSIONS
  Based on the data obtained, it is tempting to suggest that the ACP mainly develops from antral cyst, an increase in pressure in cyst forced capsule wall to herniate to middle meatus through the antral ostium, and the continuous herniation and hyperplasy leading to the formation of ACP.
authors.affiliation: Department of Otorhinolaryngology, Shenyang General Hospital of People's Liberation Army, Shenyang, China. lishsy@sina.com
authors.forename: Shu-hua
authors.initials: SH
authors.lastname: Li
authors.forename: Hong-jin
authors.initials: HJ
authors.lastname: Shi
authors.forename: Da-hai
authors.initials: DH
authors.lastname: Wu
authors.forename: Chun-hai
authors.initials: CH
authors.lastname: Shi
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D004724:Endoscopy; D005260:Female; D006801:Humans; D008297:Male; D008443:Maxillary Sinus / Q000000981:diagnostic imaging / Q000473:pathology; D008875:Middle Aged; D009298:Nasal Polyps / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D055815:Young Adult