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2012-12-10-15 Cavum vergae cyst ©Fabrice Cuillier

Cavum vergae cyst  

Fabrice Cuillier, MD, Balu M., MD,
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 

Figure 3: A simple cavum vergae cyst

Figure 4-8: At 35 weeks; Normal corpus callosus and pericallosal artery were present

Figure 9-12:
At 36 weeks, MRI confirmed the diagnosis.

Video 1, 2:
Showing the cavum vergae cyst

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