Skip to main content
Medicine LibreTexts

6.8.9: 9. Oral Cancer - Depth of Invasion

  • Page ID
    18411
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)

    • 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)AfHNS Clinical Practice Guidelines Tongue FOM
      • T2: Moderate depth (>5 to ≤10mm)
      • T3: Deeply invasive (>10 mm)
    • Extrinsic muscle infiltration no longer a staging criterion for T4 because
      • Superseded by DOI
      • Limited extrinsic muscle invasion difficult to assess