*   Department of Gynecology, Felix Guyon Hospital, 97400 Saint- Denis, Ile de la Reunion, France; tel: 0262 90 55 22; fax : 0262 90 77 30.
** Department of Radiology, Félix Guyon Hospital, 97400 Saint-Denis, Reunion’ Island, France. 

 

Case report

This is a case of a 28-year-old-woman, G2P1, with no known obstetrics risk factors and no relevant medical history. The first ultrasound showed diamniotic dichorionic twin pregnancy. The pregnancy was uncomplicated, patient was not aware of fever or any signs of infection, shortly before conception and in the first and second trimester of the pregnancy. The first trimester scan was normal, with NT=1 mm for both fetuses. Triple test was negative.

The second trimester scan performed at 22 weeks of gestation showed two female fetuses with normal growth. There were no abnormalities seen during the ultrasound examination.

The following ultrasound examination was done at 24 weeks of gestation with the following findings:

Twin A
 
Ultrasound scan revealed cerebral anomalies and these findings were confirmed by the follow-up ultrasound at 27 weeks:

Images 1,2: Image 1 shows the profile of the fetus. Image 2 shows an axial view of the fetal brain, note the borderline size of the cisterna magna (9.8 mm), increased subarachnoid space and ventriculomegaly.