Enlarged Cisterna Magna

Ashish Jain, Nidhi Jain

Case Scenario

A 32-year-old, gravida 2 woman underwent an antenatal ultrasonography (USG) at 32 weeks of gestation. There was no history of any adverse antenatal events. However, the antenatal USG at 32 weeks revealed that the fetus had an enlarged cisterna magna (ECM), of approximately 10 mm. There were no other abnormalities detected on detailed examination.

Conclusion: Antenatal isolated findings of mild ECM (10–12 mm) in the second trimester USG, in the absence of other associated anomalies, has a normal outcome and does not require any postnatal follow-ups. In cases of moderate to severe ECM findings, postnatal developmental follow-up for minor neurodevelopmental delays is required. When ECM is found to be associated with other anomalies, a karyotype assessment should be offered antenatally, and these neonates should be rigorously followed-up postnatally.

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