Department of Gynecology, Felix Guyon Hospital, 97400 Saint-Denis, Reunion’ Island, France.
Case report:
This is a 30-year-old-woman, G2P1, with no known obstetric risk factors and with no relevant medical history. The triple test was performed (1:1500) and the nuchal translucency was 1 mm (CRL = 54 mm). The first scan was normal. The fetal growth was normal. The second scan was performed at 22 weeks (Normal morphology). At 34 weeks, the third sonography was done. A central nervous system anomaly was suspected.
In our antenatal unit, at 35 weeks, serial ultrasound scans revealed no cerebral anomalies, except a cavum vergae cyst (Figure 1). The ultrasound features were suggestive of a simple cavum vergae cyst (Figure 2, 3). Corpus callosus and pericallosus artery were present (Figure 4-8).
Prenatal MRI (36 weeks) confirmed the cavum vergae cyst (Figure 9-12).
At 36 weeks, an amniocentesis was performed. The karyotype was normal (46 XX). The level of acetylcholine in amniotic fluid was normal. The PCR virus seeking was negative.
At 41 weeks, a normal delivery happened. The baby was normal. On neurological examination, there was no deficit.
Figure 1, 2: No cerebral anomalies except a cavum vergae cyst