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Stage I includes: T1, N0, M0. 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. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 6th and 7th eds.)
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