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Nasal polyposis (NP) is a small, benign (noncancerous) drop-like growth appearing in the mucosa (lining tissues) of the nose and may block the nasal passageway. Nasal polyposis tends to be present on both sides of the nasal cavity. Small nasal polyps may not reflect any symptoms, but the larger growths or groups of nasal polyps can block the nasal passages or lead to breathing problems, a lost sense of smell, and frequent infections. One-sided nasal polyps may need to be investigated further as they might be malignant nasal or sinus tumors. Nasal polyps are a subgroup of chronic rhinosinusitis
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