Background: Nasal chondromesenchymal hamartoma (NCMH) is a rare benign tumor almost always found in children. NCMH was first described by McDermott in 1998. To the best our knowledge, about 50 NCMH cases have been reported worldwide with very few adult cases and no long-term follow-ups. Case Presentation: Here, we report a 43-year-old woman who referred to the Otolaryngology Clinic of Payambar Azam Hospital, Bandar Abbas, Iran, in 2008, with a one-year history of progressive left-sided nasal obstruction that had not relieved with topical nasal decongestants and steroid sprays. A unilateral left-sided nasal soft-tissue mass was found upon examination. Histological and immunohistochemical analyses were consistent with NCMH. Trans-nasal endoscopic excision showed good results and no sign of recurrence has been observed after 12 years of regular follow-up. Conclusion: Awareness of imaging and immunohistochemical characteristics of NCMH combined with the probability of presentation in the adult population are necessary for correct diagnosis and adequate therapy.

واژه‌های کلیدی: Case report، Hamartoma، Nose neoplasm، Adult

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