title: The increasing incidence of paranasal organizing hematoma: a 20-year experience of 23 cases at a single center.
abstract: Sinonasal organized hematoma is a rare, benign disease that can be locally aggressive and may be mistaken for malignancy. Because of its rarity, the clinical characteristics are not well known. The aim of this study is to investigate the distinguishing features of organized hematoma with an emphasis on incidence change.
  
  
  
  In this retrospective study, we reviewed the records of 23 patients with organized hematoma confirmed histopathologically among 5,378 patients who underwent endoscopic sinus surgery performed by a single surgeon from January 1995 to December 2014 at a tertiary care center. Clinical symptoms, endoscopic photography, computed tomography, and operative findings were reviewed. We also reviewed the relevant literature. Age, sex, site, origin subsite and histopathology were investigated. A statistical review was performed using R 3.1.2 to examine incidence change.
  
  
  
  The most common complaint was frequent epistaxis and nasal obstruction (52.1%). Of the 23 patients, eight were women and 15 were men with an age range of 18 to 75 years. (mean 38.9 years). Nine of these hematomas occurred on the right side and 14 on the left side. The predominant occurrence site was the antrum (65%), followed by the septum (17.3%), inferior turbinate (8%), and ethmoid sinus (8%). The incidence steadily increased over 20 years.
  
  
  
  Investigation of the clinical characteristics and incidence change of organized hematoma can provide useful information. Through analysis of the 23 cases in our study, the age distribution was found to be bimodal and the incidence of organizing hematoma was observed to steadily increase. Clinicians should be aware of these characteristics to avoid misdiagnoses of malignant tumors.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Chonbuk National University, Jeonju, Korea.
authors.forename: Jong Seung
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Chonbuk National University, Jeonju, Korea.
authors.forename: Jong Seok
authors.initials: JS
authors.lastname: Oh
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Chonbuk National University, Jeonju, Korea.
authors.forename: Sam Hyun
authors.initials: SH
authors.lastname: Kwon
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004724:Endoscopy; D004844:Epistaxis / Q000175:diagnosis / Q000209:etiology / Q000601:surgery; D005260:Female; D006406:Hematoma / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D006801:Humans; D015994:Incidence; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D015508:Nasal Obstruction / Q000175:diagnosis / Q000209:etiology / Q000601:surgery; D009668:Nose Diseases / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D013517:Otorhinolaryngologic Surgical Procedures; D010254:Paranasal Sinus Diseases / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D055815:Young Adult