title: Sinonasal organized hematoma: Clinical features of seventeen cases and a systematic review.
abstract: OBJECTIVE
  Organized hematoma (OH) is a rare non-neoplastic disease. We studied the clinical characteristics of 17 patients with sinonasal OH and those of 75 cases in the English literature.
  
  
  METHODS
  Retrospective review of medical records and systematic review of the literature on OH.
  
  
  METHODS
  Comprehensive review of the English-language literature on OH was performed. We screened all eligible cases based on initial features, and 75 eligible cases found in 15 publications were analyzed. We also retrospectively analyzed and compared medical records of 17 patients diagnosed with pathologically proven sinonasal OH. Data such as demographics, clinical characteristics, pathologic features, radiologic findings, treatment modalities, and follow-up results were compared to the 75 previously mentioned cases.
  
  
  RESULTS
  Fifteen cases involved the maxillary sinus, one case involved the frontal sinus, and one case involved the sphenoid sinus. There were six patients over 60 years old, and all were taking an antiplatelet agent. The paranasal sinus computed tomography (CT) of seven patients showed bony destruction of the involved sinus. A review of the available literature revealed mostly similar results with our cases, except for the proportion of patients taking aspirin (5.3%) and sex distribution (male:female = 49:25).
  
  
  CONCLUSIONS
  We reported 17 cases of OH, including a case of frontal sinus and a case of sphenoid sinus lesion. A large proportion of OH patients had bony destruction of the affected sinus on CT. In these patients, a careful diagnosis should be made to distinguish them from a malignant tumor or other expansile diseases.
  
  
  METHODS
  4.
authors: Department of Otorhinolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, Daejeon, South Korea.
authors: Soo Jung
authors: SJ
authors: Choi
authors: Department of Otorhinolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, Daejeon, South Korea.
authors: Sung Tae
authors: ST
authors: Seo
authors: Department of Otorhinolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, Daejeon, South Korea.
authors: Ki-Sang
authors: KS
authors: Rha
authors: Department of Otorhinolaryngology-Head and Neck Surgery, Research Institute for Medical Sciences, Chungnam National University School of Medicine, Daejeon, South Korea.
authors: Yong Min
authors: YM
authors: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D004724:Endoscopy; D005260:Female; D006406:Hematoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010254:Paranasal Sinus Diseases / Q000175:diagnosis*; D010256:Paranasal Sinuses / Q000000981:diagnostic imaging / Q000473:pathology; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods; D055815:Young Adult
keywords: Hematoma; epistaxis; maxillary sinus; sinonasal tumor