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Prenatal ultrasonographic diagnosis of an aneurysm of the vein of Galen

Department of Obstetrics and Gynaecology, Northwick Park Hospital, Watford Road, Harrow, Middlesex HA1 3UJ, UK

This excerpt was created in the absence of an abstract.

A 31-year-old white woman, gravida 2, para 1 was admitted to hospital because of pre-term labour at 29 weeks gestation. An ultrasound scan at 18 weeks gestation at the referring hospital had shown normal fetal anatomy.

On admission, an ultrasound scan revealed a midline, fusiform, echo-free area measuring 35 mm x 20 mm x 20 mm in the fetal brain, superior to the thalamus and extending posteriorly (Fig. 1). The remainder of the fetal anatomy was normal, except for mild left-sided renal pelvic dilatation. There were no signs of fetal hydrops or ascites. An aneurysm of the vein of Galen (AVG) was suspected and Doppler studies were performed which revealed arterial type flow within the cystic structure (Fig. 2).

Key Words: Prenatal • Ultrasound • Doppler • Aneurysm of the vein of Galen

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