Presentation
Headache and giddiness. Referred for CT scan.
Patient Data
Age: 50 years
Gender: Female
From the case:
Cavum velum interpositum cyst
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There is a dilated CSF space involving the velum interpositum with a 3.1 x 3.0 cm sized cavum velum interpositum arachnoid cyst. Small lacunar infarct noted in left corona radiata. Generalized cerebral atrophy.
Case Discussion
The cavum velum interpositum (CVI) is a thin, triangular-shaped cerebrospinal fluid (CSF)-filled space between the lateral ventricles that lies below the fornices and above the third ventricle. It is a normal variant. When larger than 1 cm in axial transverse measurement, with outwardly bowed margins and positive mass effect, the term cyst of the velum interpositum or cavum velum interpositum cyst should be used.
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