The clinicopathological features of sinonasal angiomatous polyps

Yuan-Yun Tam,1,* Chia-Chen Wu,2,* Ta-Jen Lee,2 Yang-Yu Lin,3 Tai-Di Chen,4 Chi-Che Huang2 1Department of Otorhinolaryngology – Head and Neck Surgery, Lotung Poh-Ai Hospital, Yilan County, 2Department of Otorhinolaryngology – Head and Neck Surgery, 3Department of Medical Imaging and Intervention, 4Department of Pathology, Linkou Chang Gung Memorial Hospital, Chang Gung University, Taoyuan County, Taiwan *These authors contributed equally to this work 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.Conclusion: 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. Keywords: sinonasal angiomatous polyp, angiomatous polyp, antrochoanal polyp, angiomatous nasal polyp, infarcted nasal polyp