Abnormal cerebral ventricle morphology Subependymal cysts Subependymal pseudocyst HP:0002416 Subependymal germinolytic cyst UMLS:C1833431 Cerebral cysts, usually located in the wall of the caudate nucleus or in the caudothalamic groove. They are found in up to 5.2% of all neonates, using transfontanellar ultrasound in the first days of life. In the vast majority of cases, a simple persistence of the germinal matrix is proposed to explain their presence in asymptomatic preterm neonates. Viral infections, mainly with CMV and rubella, are commonly found when the pseudocysts are associated with other abnormalities of the central nervous system. The pseudocysts are then often multilocular. Intracranial cystic lesion