“…The SNC incidence rate is below 1–2 per 100,000 person-years and more frequent (roughly double) in men [ 3 , 4 , 5 , 6 , 7 ]. The most frequently affected anatomical sites are the nasal cavity and the maxillary and ethmoidal sinuses [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. The majority of SNCs (80%) are epithelial; the most frequent morphologies are squamous cell carcinoma (SCC), mostly in the maxillary sinus and nasal cavity, and intestinal-type adenocarcinoma (ITAC), which often arises in the ethmoidal sinus [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”