Arachnoid Cyst

Scott A. Drummond, Jr., DO, DABR Reviewed 06/2017
 


BASICS

DESCRIPTION

  • Histologically benign, CSF-filled, space-occupying lesion of the central nervous system

  • May be intracranial (most are supratentorial), spinal, or perineuronal

  • Classification (1)

    • Prima...

DIAGNOSIS

HISTORY

  • Most cases are asymptomatic, and the cyst is an incidental finding.

  • Presenting symptoms depend on the size and location of the cyst and are often nonspecific (1,4):

    • Intracranial arach...

TREATMENT

Most patients are asymptomatic or have symptoms that are best managed by observation. Treatment is indicated when cysts cause mass effect or become symptomatic—often regardless of size or lo...

ONGOING CARE

FOLLOWUP RECOMMENDATIONS

MONITORING

  • Repeat CTs or MRIs are recommended, no more than yearly, for patients being managed by clinical observation.

  • For incidentally discovered arachnoid cysts i...

REFERENCES

Cincu R, Agrawal A, Eiras J. Intracranial arachnoid cysts: current concepts and treatment alternatives. Clin Neurol Neurosurg.  2007;109(10):837–843. [View Abstract on OvidInsights]
H...

CODES

ICD10

  • G93.0 Cerebral cysts

  • Q04.6 Congenital cerebral cysts

ICD9

  • 348.0 Cerebral cysts

  • 742.4 Other specified congenital anomalies of brain

SNOMED

  • 33595009 arachnoid cyst (disorder)

  • 19276002 congenital cer...

PEARLS

  • Most arachnoid cysts are asymptomatic and do not require treatment.

  • The degree of symptoms produced by an arachnoid cyst, not the cyst’s location or size, is the most important factor in surgica...

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