A frequent discovery that can be seen on screening or diagnostic ultrasound are small cysts within your baby’s brain called choroid plexus cysts or CPCs. First of all, they are not within the substance of the brain tissue and are not interrupting the growth or development of your baby’s brain.
Within the brain is a system of tubes that circulate the cerebral-spinal fluid. Within these tubes, which are called lateral ventricles, is the tissue known as the choroid plexus, a tissue which makes the cerebral-spinal fluid. As this tissue grows and develops, it frequently folds over upon itself creating small pockets of fluid. These are the choroid plexus cysts.
They are most likely a normal expression of normal fetal development and almost always resolve by 28 weeks of pregnancy. There is a poor association of CPCs with a severe fetal condition called Trisomy 18. In the absence of other birth defects such as major heart defects, facial defects, abdominal wall defects or hand or foot abnormalities, CPCs by themselves do not statistically increase your risk for Trisomy 18.
If your baby has other concerning findings on blood work or on ultrasound, your doctor may want you to undergo further testing by more extensive blood work or by amniocentesis.
Dr. Berry, his genetic counselor or your obstetric health provider can answer any questions you may have. Usually, the only further testing needed would be a repeat ultrasound at around 28 week.
Should you have any questions, we here at Austin Perinatal are happy to answer them at any time.