Lip and Oral Cavity Cancer pT4a TNM Finding v8

**Semantic type:** Finding

**Definition:** Lip and oral cavity cancer with moderately advanced local disease. For lip: Tumor invades through cortical bone or involves the inferior alveolar nerve, floor of mouth, or skin of face (i.e., chin or nose). For oral cavity: Tumor invades adjacent structures only (e.g., through cortical bone of the mandible or maxilla, or involves the maxillary sinus or skin of face). Note: Superficial erosion of bone/tooth socket (alone) by a gingival primary is not sufficient to classify a tumor as T4. (from AJCC 8th Ed.)

**Synonyms:** - Lip and Oral Cavity Carcinoma pT4a TNM Finding v8