Arachnoid cysts

Definition

The arachnoid cyst is a cerebral cyst, the walls of which are formed by a cobweb. Arachnoid cysts are located between the surface of the brain and arachnoid (arachnoid) membrane.

Morphology

Cyst of the convectal brain surface

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Fig. 28

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Pic.30

The parasagittal cyst

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Fig.35

Cyst of the lateral cleft of the brain

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Fig. 29

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Fig. 32

Intrasellar and suprasellar cysts

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Fig. 36

Cyst of the intermediate veli (Cavum veli interpositi)

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Fig.35

Cyst of the cerebellar angle region

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Fig. 34

Upper and lower retrocerebellar cysts

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Fig.31

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Fig.33

Supracerebellar arachnoid cyst

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Fig.37

Arachnoid cyst of the quadrigeminal plate cistern

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Fig.38

Differential diagnostics

  • The epidermoid cyst (holistheatoma)

  • Cystic-gliotic changes that occurred in utero, as consequences of ischemic-hypoxic changes or infection

  • Extended pachyon granulation

  • Local expansion of subarachnoid space (anatomical variants)

  • Subdural hygroma

Treatment

Arachnoid cyst is an anomaly of development, without a tendency to develop and without progression of neurological symptoms. Nevertheless, in the presence of a cyst in the region of the sellar region or the region of the IV ventricle, as well as infratentrinally, there may be liquorodynamic disturbances.

Treatment of arachnoid cysts is indicated when symptoms appear that are proven to be the cause of the presence of an arachnoid cyst. Dislocation and displacement of the brain structures, increasing with dynamic observation, is also an indication for surgical treatment. Before surgical treatment, contrast cystinography may be required. There are various methods of emptying the liquor contents of arachnoid cysts.

  • Shunting - drainage into subdural space or abdominal cavity

  • Fenestration: craniotomy with excision of the cyst, various endoscopic techniques, including laser

  • Drainage by needle aspiration




Author: Radiologist, Ph.D. Vlasov Evgeniy Alexandrovich

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