Greene M F, Benacerraf B R, Frigoletto F D
Am J Obstet Gynecol. 1987 Mar;156(3):687-9. doi: 10.1016/0002-9378(87)90078-0.
A series of 10 consecutive cases of alobar holoprosencephaly is described. The disorder was diagnosed prenatally by ultrasound according to two criteria: a large central fluid collection in the fetal head, with no visible midline structures but with the presence of a mantle around the fluid collection and fusion of the thalami and corpus striatum, and sonographic abnormalities of the face, including hypotelorism, central clefts, facial asymmetry, and abnormal orbits.