Kuhn classification

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Kuhn classification is an anatomical classification for the subtypes of frontal cells:

  • type 1 (~37%): a single air cell above the agger nasi cell
  • type 2 (~19%): two or more air cells above the agger nasi cell
  • type 3 (~7%): a single large cell above the agger nasi cell that extends into the frontal sinus
  • type 4 (rare): cells are entirely contained within the frontal sinus

See also