Enlarged fetal cisterna magna: appearance and significance.
The differential diagnosis of a posterior fossa fluid collection in the fetus includes an enlarged cisterna magna, Dandy-Walker syndrome, or a posterior fossa cyst, each of which has differing implications for perinatal management. Causes of an enlarged cisterna magna include cerebellar hypoplasia, communicating hydrocephalus, and normal variation. Cerebellar hypoplasia is a frequent finding in the trisomies and therefore a careful search should be made for associated cardiac anomalies, growth retardation, and polyhydramnios.
D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D002902:Chromosomes, Human, 16-18; D002946:Cisterna Magna / Q000002:abnormalities*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014314:Trisomy; D014463:Ultrasonography