Lip and Oral Cavity Cancer pT4a TNM Finding v6

**Semantic type:** Finding

**Definition:** Oral cavity cancer with tumor invading adjacent structures (e.g. through cortical bone, into deep [extrinsic] muscle of the tongue [genioglossus, hyoglossus, palatoglossus, and styloglossus], maxillary sinus, skin of face). (from AJCC 6th Ed.)