Brain, Arachnoid cyst [LMP31479]

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Image Details
Diagnostic Modality: 
Whole Slide Image
Disease Category: 
Neoplasia
Diagnosis: 
Arachnoid cyst
Species: 
Human
Organ System: 
Central Nervous System
Gender: 
Female
Age: 
55 years
Diagnosis Code: 
ICD-10: G93.0
Slide Contributor Information
Gao, A., Munoz, D.

Keywords

Meninges, meningothelial

Clinical History

55 year-old woman with large extra-axial cyst over the frontal convexity.

Clinical Discussion

Arachnoid cysts are non-neoplastic, extra-axial cysts arising from the arachnoid and containing cerebrospinal fluid. Most are congenital and typically occur in the middle cranial fossa. Usually they are asymptomatic but sometimes may cause mass effect. In these cases, surgery is curative. Microscopically, they are lined by a layer of mature arachnoid cells, but the lining is delicate and may be lost or not apparent. The lining cells stain for EMA.