Sign Up for a Free Account

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

Sign Up for a Free Account For information on discounts, see Plans & Pricing

  • 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.

  • Listen to MedLink on the go with Audio versions of each article.

Ependymal cyst in cerebello-pontine angle of fourth ventricle

Ependymal cyst in cerebello-pontine angle of fourth ventricle of a 3.5-year-old girl with several months of progressive apneic spells and vomiting. Excision was successful and she was asymptomatic after surgery. Immunocytochemical reactivities of (A) S-100β protein, X200 (B) vimentin, X250, and (C) glial fibrillary acidic protein (GFAP), X200, were all strongly positive in the simple cuboidal epithelial cells, typical of ependymal cysts. GFAP distinguishes ependymal cysts because it is not expressed in choroid plexus cyst epithelium. In addition, chronic parenchymal gliosis is seen at the base of the cyst. The convoluted appearance of the epithelium is artifactual due to intraoperative collapse of the cyst. (Contributed by Dr. Harvey Sarnat.)

Related Article

Related Media

Associated Disorders

  • Aicardi syndrome
  • Callosal dysgenesis
  • Neuronal heterotopia
  • Orofaciodigital syndromes, especially types I and II
  • Polymicrogyria
  • Trisomy-18