Subglottic Cancer pT4a TNM Finding v7

**Semantic type:** Finding

**Definition:** Subglottic cancer with moderately advanced local disease. Tumor invades cricoid or thyroid cartilage and/or invades tissues behind the larynx (e.g. trachea, soft tissues of neck including deep extrinsic muscles of the tongue, strap muscles, thyroid, or esophagus). (from AJCC 7th Ed.)