Stage IA Nasopharyngeal Carcinoma AJCC v9

**Semantic type:** Neoplastic Process

**Definition:** Stage IA includes: T1-T2, N0, M0. T1: Tumor confined to nasopharynx or tumor extension to any of the following without parapharyngeal involvement: oropharynx, nasal cavity. T2: Tumor extension to any of the following: parapharyngeal space, adjacent soft tissue involvement of medial pterygoid, lateral pterygoid, prevertebral muscles. N0: No tumor involvement of regional lymph node(s). M0: No distant metastasis. (AJCC 9th ed.)