Leeds Fetal Medicine Unit Website

Choroid Plexus Cyst

Definition	Cyst within the choroid plexus of the brain
Incidence	1:100 second trimester fetuses
Diagnosis	Ultrasound appearances of unilateral or bilateral cysts (>2mm) within the choroid plexus
Gestation at diagnosis	Visible 14 weeks onwards
Known chromosomal or genetic association	Yes, Trisomy 18 (Edwards syndrome)
Further investigations	Karyotype only if associated with other markers of chromosomal abnormality or advanced maternal age
Differential Diaganosis	Ventriculomegaly
Prognosis	Excellent if not associated with Trisomy 18
Recurrance risk	Low
Research Studies	None

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