case_images: PMC11606364_01
case_images: Midsagittal view of fetal head with cytomegalovirus infection at 12 weeks and 3 days of gestation demonstrating a hyperechoic thalamus, which is typically anechoic under normal conditions. The caudal anechoic band indicates the third ventricle. T: Thalamus; 3V: Third ventricle; BS: Brain stem; AS: Aqueduct of Sylvius; 4V: Fourth ventricle; CM: Cisterna magna; NT: Nuchal translucency.
case_images: 97629-g001.jpg
case_images: PMC11606364_01_97629-g001.jpg
case_images: F1
case_images: The anatomical examination was mostly normal, except for a round hyperechoic thalamus located above the non-obliterated third ventricle (Figure 1), which usually appears anechoic.
case_images: Axial view of the fetal head in the third trimester. A: The transverse view of the fetal head at 35 weeks of gestation demonstrated midline and intraventricular calcifications (orange arrow); B: At 38 weeks of gestation, the transverse view exhibited multiple cysts, ventriculomegaly, and a smooth brain surface (lissencephaly).
case_images: 97629-g002.jpg
case_images: PMC11606364_01_97629-g002.jpg
case_images: F2
case_images: Follow-up ultrasound examinations at 30, 32, 35, and 38 weeks of GA revealed progressive manifestations of microcephaly, multiple intraventricular or parenchymal calcifications, subependymal multiseptal cysts, moderate ventriculomegaly, lissencephaly, and small for gestational age (Figure 2).