Respiratory epithelial adenomatoid hamartoma originating from the nasal floor: A case report

Respiratory epithelial adenomatoid hamartoma (REAH) is a relatively rare disease that commonly occurs in the olfactory cleft, followed by the posterior nasal septum within the nasal cavity. We herein report a case of REAH on the nasal floor, which is an extremely rare anatomical site for the occurrence of REAH. A 63-year-old man was referred to our department because he had developed right epistaxis. Endoscopic examination revealed a protruding lesion on the floor of the right nasal cavity. The tumor was endoscopically removed and histopathological examination revealed that the tissue was characterized by proliferation of glandular duct structures composed of multiciliated cells and glandular cells, consistent with isolated REAH. No evidence of recurrence was observed endoscopically 14 months after surgery. The findings indicate that REAH can occur in the nasal cavity at sites covered by the respiratory mucosa that have not been previously reported and should be treated with caution.