Choroid plexus cysts: a normal finding on ultrasound.

Within a period of 2.5 years, cystic structures in the choroid plexus were encountered at cerebral sonography in 70 neonates and babies (45 male, 25 female; 18 premature babies). Their prevalence in patients examined during the first 4 weeks of life (n = 55) was 3%. The size of the cysts ranged from 1-4 and, rarely, up to 7 mm. They were mostly solitary and unilateral. Follow-up sonograms over periods up to 13 months showed that most of the cysts persisted unchanged. A few disappeared (n = 7), while distinct increase in size was observed in 1 case. Since no additional sonographic changes were observed and none of the patients displayed any neurological abnormalities and no association existed with any other, particularly chromosomal, disease, such plexus cysts are postulated to represent a normal sonographic finding and do not require follow-up.