Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Arachnoid Cyst

  • Barbara Spacca
  • Andrew BrodbeltEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_539

Synonyms

Temporal lobe agenesis

Short Description or Definition

Arachnoid cysts are benign intracranial space occupying lesions. An arachnoid membrane surrounds a collection of clear fluid, identical to cerebrospinal fluid (CSF). Arachnoid cysts present due to mass effect, sudden hemorrhage, or incidentally.

Categorization

Arachnoid cysts are classified according to their location as intracranial or spinal. Intracranial arachnoid cysts can be further subclassified (Table 1). Middle fossa cysts (MFAC) can also be classified according to their size and distortion of surrounding structures based on Galassi classification (Galassi et al. 1982). Type I cysts are small, biconvex, and have no mass effect (Fig. 1a); type II cysts have a rectangular shape and involve proximal and intermediate segments of the Sylvian fissure (Fig. 1b); type III cysts entirely involve the Sylvian fissure and can produce midline shift (Fig. 1c). Arachnoid cysts may also be classified as primary congenital or...
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References and Readings

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Anna Meyer Children’s HospitalFlorenceItaly
  2. 2.The Walton Centre NHS Foundation TrustLiverpoolUK