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The choroid plexus pseudocyst: sonographic identification and characterization.

N L Nelson¹, P W Callen, R A Filly

¹Department of Radiology, University of California, San Francisco 94143-0628.

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine

|November 1, 1992

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Fetal choroid plexus cysts may be normal structures, not abnormalities. Identifying this pseudocyst, possibly the corpus striatum, can prevent unnecessary amniocentesis and diagnostic errors.

Area of Science:

Fetal imaging
Neurosonography
Prenatal diagnosis

Background:

Fetal choroid plexus cysts are sometimes linked to karyotype abnormalities.
This association has led to recommendations for amniocentesis upon discovery of these cysts.

Purpose of the Study:

To investigate a common sonographic finding that mimics fetal choroid plexus cysts.
To determine if this finding represents a normal anatomical structure, thereby avoiding unnecessary invasive procedures.

Main Methods:

Prospective analysis of 50 consecutive fetal ultrasound examinations.
Detailed sonographic evaluation of the choroid plexus and adjacent structures.

Main Results:

An oval hypoechoic structure simulating a cyst was observed in 39 out of 50 fetuses (78%).

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This structure, projecting into the choroid plexus, is likely the corpus striatum.

The identified structure is presumed to be a normal anatomical variant.

Conclusions:

The common finding simulating a fetal choroid plexus cyst is likely a normal structure (pseudocyst), possibly the corpus striatum.
Awareness of this benign finding can reduce diagnostic errors.
This knowledge may help avoid unnecessary amniocenteses in prenatal diagnosis.