Seromucinous Hamartoma Versus Low-Grade Sinonasal Adenocarcinoma: A Worrying Mass of the Ethmoid Sinus

An elderly woman presented with vertigo and loss of memory. Computed tomography, positron emission tomography–computed tomography scan, and magnetic resonance imaging studies demonstrated a right ethmoid mass with evidence of bony erosion. The patient had no nasal symptoms. Endoscopy showed a polypoid mass in the right olfactive cleft. Operative biopsy wavered between benign seromucinous hamartoma and low-grade adenocarcinoma. The patient underwent a complete excision of the mass. Final histology de!nitively proved the presence of a seromucinous hamartoma. No adverse events were noted. No adjuvant treatment was delivered. Follow-up was reassuring at 1 year.