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Sinonasal polyps are benign mucosal swellings that occur in four different histological patterns. The most common type is the edematous, eosinophilic (so-called "allergic") nasal polyp, which constitutes 85–90% of nasal polyps. The edematous polyp is morphologically characterized by edema, goblet cell hyperplasia of the epithelium, thickening of the basement membrane, and of numerous leukocytes, predominantly eosinophils. The second histological type is a fibroinflammatory polyp characterized by chronic inflammation and metaplastic changes of the overlying epithelium. Another rare variant presents with pronounced hyperplasia of seromucinous glands, but otherwise shows many similarities with the edematous type of polyp. The fourth type is very rare and is a polyp with atypical stroma. This latter polyp calls for awareness and careful histological examination to avoid misdiagnosis of a neoplasm.

Document Type: Research Article


Publication date: September 1, 1996

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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