Bilateral Choroid Plexus Cysts: What to Expect During Pregnancy - Obstetrics and Gynecology

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Bilateral choroid plexus cysts (CPCs) are relatively common findings during routine prenatal ultrasounds, occurring in approximately 1% to 3% of pregnancies during the second trimester. These cysts are fluid-filled sacs located in the brain's choroid plexus, which is responsible for producing cerebrospinal fluid. While the discovery of CPCs can be concerning for expectant parents, it is important to understand the context and implications of this finding.

Firstly, the majority of bilateral choroid plexus cysts are benign and often resolve on their own as the pregnancy progresses. In fact, many cases of CPCs identified in the second trimester disappear by the third trimester. The presence of these cysts is generally not associated with any significant risk to the fetus, especially if there are no other concerning ultrasound findings or maternal risk factors.

Regarding the concern about chromosomal abnormalities, studies indicate that the presence of bilateral CPCs is associated with a very low risk of conditions such as trisomy 18 (Edwards syndrome), which is a serious genetic disorder. The estimated risk of having a chromosomal abnormality in a fetus with isolated bilateral CPCs is about 1 in 400, which is relatively low. If the mother is not of advanced maternal age, and if other screening tests (such as the first-trimester combined screening or non-invasive prenatal testing) have returned normal results, the likelihood of a chromosomal abnormality is further reduced.

In your case, since you have undergone amniocentesis, the results will provide more definitive information regarding the genetic status of the fetus. It is understandable to feel anxious while waiting for these results, but it is important to remember that many pregnancies with CPCs result in healthy outcomes. The recommendation for termination of pregnancy based on the presence of CPCs alone is not standard practice unless there are additional concerning findings or significant risk factors.

As for the management of your pregnancy, it is crucial to maintain open communication with your healthcare provider. They will monitor the situation closely and provide guidance based on the results of the amniocentesis and any further ultrasounds. If the results are normal, it is likely that no additional intervention will be necessary, and you can continue with your pregnancy as planned.

In summary, while the discovery of bilateral choroid plexus cysts can be alarming, it is essential to approach the situation with a balanced perspective. The majority of cases resolve without complications, and the risk of associated chromosomal abnormalities is low, especially in the absence of other risk factors. Awaiting the results of the amniocentesis will provide clarity and help guide your next steps. In the meantime, focus on self-care and seek support from your healthcare team and loved ones during this time.