Stage IVB Oropharyngeal Undifferentiated Carcinoma AJCC v7

**Semantic type:** Neoplastic Process

**Definition:** Stage IVB includes: (T4b, Any N, M0); (Any T, N3, M0). T4b: Tumor with very advanced local disease. Tumor invades lateral pterygoid muscle, pterygoid plates, lateral nasopharynx, or skull base or encases carotid artery. N3: Tumor with metastasis in a lymph node more than 6 cm in greatest dimension. M0: No distant metastasis. (AJCC 7th ed.)

**Synonyms:** - Stage IVB Oropharyngeal Lymphoepithelioma - Stage IVB Oropharyngeal Lymphoepithelioma AJCC v7 - Stage IVB Oropharyngeal Undifferentiated Carcinoma - Stage IVB Undifferentiated Oropharyngeal Throat Cancer