Fetal hydrocephaly at 21 weeks of gestation

All four images were obtained using transvaginal sonography.
(A) Posterior coronal section showing the very large posterior horns of the lateral ventricles. In the posterior fossa, a relatively normal appearing cerebellum (between arrows) and the cisterna magna are seen.
(B) A more anterior section than (A) and also showing dilation of the lateral ventricles (Lv).
(C) An axial section showing the large ventricles, the dangling choroid plexus, and the very thin cortical mantle.
(D) Oblique section showing the hydrocephaly.