label: Stage IV Hypopharyngeal Carcinoma AJCC v6
label_lc: stage iv hypopharyngeal carcinoma ajcc v6
description: "Stage IV includes: IVA (T4a, N0, M0); (T4a, N1, M0); (T1, N2, M0); (T2, N2, M0); (T3, N2, M0); (T4a, N2, M0); IVB (T4b, Any N, M0); (Any T, N3, M0); IVC (Any T, Any N, M1).  T4a: Tumor invades thyroid/cricoid cartilage, hyoid bone, thyroid gland, esophagus, or central compartment soft tissue.  T4b: Tumor invades prevertebral fascia, encases carotid artery, or involves mediastinal structures.  N2: Metastasis in a single ipsilateral lymph node, more than 3cm but not more than 6cm in greatest dimension, or in bilateral or contralateral lymph nodes, none more than 6 cm in greatest dimension.  N2a: Metastasis in a single ipsilateral lymph node more than 3 cm but not more than 6 cm in greatest dimension.  N2b: Metastasis in multiple ipsilateral lymph nodes, none more than 6 cm in greatest dimension. N2c: Metastasis in bilateral or contralateral lymph nodes, none more than 6 cm in greatest dimension.  N3: Metastasis in a lymph node more than 6 cm in greatest dimension.  M1: Distant metastasis. (AJCC 6th ed.)"