Subglottic Cancer pT4a TNM Finding v6

**Semantic type:** Finding

**Definition:** Subglottic cancer with tumor invading cricoid or thyroid cartilage and/or invading 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 6th Ed.)