malignant neoplasm of ethmoid sinus TNM staging regional lymph nodes (N) N2b
malignant neoplasm of ethmoid sinus tnm staging regional lymph nodes (n) n2b
malignant tumor of ethmoid sinus TNM staging regional lymph nodes (N) N2b
malignant tumor of ethmoid sinus tnm staging regional lymph nodes (n) n2b