Vermian lobulation

Last revised by Rohit Sharma on 31 Jan 2020

Evaluation of vermian lobulation is essential in assessment of the vermian maturity. MRI is a useful tool in assessment of the fetal posterior fossa.

Radiographic features

Normal vermian lobulation by weeks 1:

  • by 21 weeks: the prepyramidal fissure can be seen between the tuber and pyramis
  • 21 to 22 weeks: the preculminate fissure can be seen in between the central lobule and culmen.
  • 24 weeks: the secondary fissure can be seen between the pyramis and uvula
  • from 27 weeks: all vermian lobules and fissures become visible

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