TABLE 90-5
| Table 90-5. Primary Tumor Staging Characteristics for Oral Cavity Carcinoma | |
| Tx | Primary tumor cannot be assessed |
| T0 | No evidence of primary tumor |
| Tis | Carcinoma in situ |
| T1 | Tumor 2 cm or less in greatest dimension |
| T2 | Tumor more than 2 cm but less than 4 cm in greatest dimension |
| T3 | Tumor more than 4 cm in greatest dimension (lip) |
| T4 | Tumor invades adjacent structures, e.g., through cortical bone, tongue, skin of neck (oral cavity) |
| T4 | Tumor invades adjacent structures, e.g., cortical bone, deep tissues (extrinsic muscle of tongue, maxillary sinus, skin) |