title: The clinicopathological features of sinonasal angiomatous polyps.
abstract: BACKGROUND
  Sinonasal angiomatous polyp (SAP) is a rare subtype of sinonasal polyp that might be misdiagnosed as a malignant lesion due to its clinical symptoms.
  
  
  METHODS
  We retrospectively enrolled the patients who were diagnosed with SAP in our hospital during 2008-2015. We analyzed the clinical symptoms, radiological findings, and pathological features of all patients diagnosed with SAP.
  
  
  RESULTS
  Unilateral nasal obstruction, rhinorrhea, and epistaxis were the common symptoms. SAPs all originated from maxillary sinus and extended to nasal cavity with or without involving the nasopharynx. Expansile mass with surrounding bony destruction is typical on computed tomography imaging but specific for SAPs. The magnetic resonance revealed high signal intensity on T1-weighted images and hypointense rim on T2-weighted images.
  
  
  CONCLUSIONS
  Computed tomography and magnetic resonance together might give rise to more accurate diagnosis of SAP. Incisional biopsy does help if the clinician suspects a malignant lesion. To treat SAP, complete removal is the optimal choice.
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Lotung Poh-Ai Hospital, Yilan County, Taiwan.
authors.forename: Yuan-Yun
authors.initials: YY
authors.lastname: Tam
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan County, Taiwan.
authors.forename: Chia-Chen
authors.initials: CC
authors.lastname: Wu
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan County, Taiwan.
authors.forename: Ta-Jen
authors.initials: TJ
authors.lastname: Lee
authors.affiliation: Department of Medical Imaging and Intervention, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan County, Taiwan.
authors.forename: Yang-Yu
authors.initials: YY
authors.lastname: Lin
authors.affiliation: Department of Pathology, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan County, Taiwan.
authors.forename: Tai-Di
authors.initials: TD
authors.lastname: Chen
authors.affiliation: Department of Otorhinolaryngology - Head and Neck Surgery, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan County, Taiwan.
authors.forename: Chi-Che
authors.initials: CC
authors.lastname: Huang
keywords: angiomatous nasal polyp; angiomatous polyp; antrochoanal polyp; infarcted nasal polyp; sinonasal angiomatous polyp