Sign Up for a Free Account

This is an image preview.
Start a Free Account
to view the full image.

  • Nearly 3,000 illustrations, including video clips of neurologic disorders.

  • Every article is reviewed by our esteemed Editorial Board for accuracy and currency.

  • Full spectrum of neurology in 1,200 comprehensive articles.

Crowding of the posterior fossa

Crowding of the posterior fossa manifests by narrowing of the prepontine space (orange arrow), flattening of the pons (black arrow), and decrease of the mamillopontine distance (blue arrow). Tonsillar ectopia is noted by the green arrow. (Contributed by Dr. Simy Parikh.)

Related Media

Associated Disorders

  • Connective tissue matrix disorders
  • Klippel-Trenaunay syndrome