Cavum velum interpositi is the space between the layers of the tela choroidea of the
third ventricle. This space occasionally appears as an anechoic lesion in routine
mid-trimester targeted scans because of the presence of fluid inside. This is then
called a cavum velum interpositi (CVI) cyst. CVI cyst is a rare finding with varied
outcomes. Councellings management are consequently confusing. This study was aimed
at assessing the outcome of CVI cysts to guide the treating clinician and address
apprehensions of the expecting couple. Genetic evaluation and MRI to prove the inncocuous
nature of CVI cysts is expensive and needs to be offered in an appropriate perspective.
A fetal Neurosonogram was conducted in all the targeted scans and the brain was visualized
in coronal, axial, sagittal and oblique saggital planes. The fetuses with a CVI cyst
were followed antenatally and up to 6 months post delivery. The study concluded that
CVI cysts appear to be an innocuous finding as neurological outcome of all four cases
who continued pregnancy was normal. One patient terminated the pregnancy for an extra
Central Nervous System anomaly.
Keywords
CVI cyst - Cavum velum interpositi cyst - Midline cysts brain - Anechoic intracranial
cyst
