C31 - Malignant neoplasm of accessory sinuses C31 - Malignant neoplasm of accessory sinuses
C31.0 - Malignant neoplasm of maxillary sinus C31.1 - Malignant neoplasm of ethmoidal sinus C31.2 - Malignant neoplasm of frontal sinus C31.3 - Malignant neoplasm of sphenoid sinus C31.8 - Malignant neoplasm of overlapping sites of accessory sinuses C31.9 - Malignant neoplasm of accessory sinus, unspecified