label: Stage IV Hypopharyngeal Squamous Cell Carcinoma AJCC v7
label_lc: stage iv hypopharyngeal squamous cell carcinoma ajcc v7
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 with moderately advanced local disease.  Tumor invades the thyroid/cricoid cartilage, hyoid bone, thyroid gland, or central compartment soft tissue.  Central compartment soft tissue includes prelaryngeal strap muscles and subcutaneous fat.  T1: Tumor limited to one subsite of hypopharynx and/or 2 cm or less in greatest dimension.  T2: Tumor invades more than one subsite of the hypopharynx or an adjacent site, or measures more than 2 cm but not more than 4 cm in greatest diameter without fixation of hemilarynx.  T3: Tumor measuring more than 4 cm in greatest dimension or tumor with fixation of hemilarynx or extension to esophagus.  T4b: Tumor with very advanced local disease.  Tumor invades prevertebral fascia, encases carotid artery, or involves mediastinal structures.  N0: No regional lymph node metastasis.  N1: Metastasis in a single ipsilateral lymph node, 3 cm or less in greatest dimension. N2: Tumor with metastasis in a single ipsilateral lymph node, more than 3 cm but not more than 6 cm in greatest dimension, or in multiple ipsilateral lymph nodes, none more than 6 cm in greatest dimension, or 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.  M0: No distant metastasis.  M1: Distant metastasis. (AJCC 7th ed.)"