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Keros Classification

Classifies the depth of the olfactory fossa defined as follows:

  • Keros I: 1-3mm 
  • Keros II: 3-7mm 
  • Keros III: 7-16mm

Keros P. [On the practical value of differences in the level of the lamina cribrosa of the ethmoid]. Z Laryngol Rhinol Otol. 1962;41:809-13.

Contributor: Alex Goel, MD

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