Stage III includes: (T3, N0, M0); (T1, N1, M0); (T2, N1, M0); (T3, N1, M0). T3: Maxillary sinus: Tumor invading any of the following: bone of the posterior wall of maxillary sinus, subcutaneous tissues, floor or medial wall of orbit, pterygoid fossa, or ethmoid sinuses. Ethmoid sinus: Tumor invading the medial wall or floor of the orbit, maxillary sinus, palate, or cribriform plate. T1: Maxillary sinus: Tumor limited to the maxillary sinus mucosa with no erosion or destruction of bone. Ethmoid sinus: Tumor restricted to any one subsite, with or without bony invasion. T2: Maxillary sinus: Tumor causing bone erosion or destruction including extension into the hard palate and/or middle nasal meatus, except extension to posterior wall of maxillary sinus and pterygoid plates. Ethmoid sinus: Tumor invading two subsites in a single region or extending to involve an adjacent region within the nasoethmoidal complex, with or without bony invasion. N0: No regional lymph node metastasis. N1: Metastasis in a single ipsilateral lymph node, 3 cm or less in greatest dimension. M0: No distant metastasis. (AJCC 6th and 7th eds.) [from NCI]