6.8.9: 9. Oral Cancer - Depth of Invasion
- Page ID
- 18411
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- Distance from adjacent normal basement membrane to deepest point of cancer (Blue plumb lines)
- Correlates with prognosis and occult nodal metastases
- Preoperative assessment
- Palpation +/- imaging
- Must distinguish exophytic from invasive cancers (see adjacent figures)
- T-stage increases with every 5mm
- T1: Less invasive (≤5 mm)
- T2: Moderate depth (>5 to ≤10mm)
- T3: Deeply invasive (>10 mm)
- T1: Less invasive (≤5 mm)
- Extrinsic muscle infiltration no longer a staging criterion for T4 because
- Superseded by DOI
- Limited extrinsic muscle invasion difficult to assess