NCI Dictionary of Cancer Terms
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stage 0 nasal cavity and ethmoid sinus carcinoma in situ (... NAY-zul KA-vih-tee … ETH-moyd SY-nus KAR-sih-NOH-muh in SY-too)
Abnormal cells are found in the innermost lining of the nasal cavity or ethmoid sinus. These abnormal cells may become cancer and spread into nearby normal tissue.