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Subependymal cyst in the trigone region of the lateral ventricle

Subependymal cyst in the trigone region of the lateral ventricle of a 2-month-old infant secondary to a small germinal matrix hemorrhage in the perinatal period. The cyst is filled with clear fluid after the blood has resolved, and the ependyma overlying it is preserved and normal. Subacute gliosis is seen in the subependymal region. Fetal ultrasound and MRI may be confusing is distinguishing subependymal and true ependymal cysts. Vimentin immunoreactivity. (Contributed by Dr. Harvey B Sarnat.)

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  • Aicardi syndrome
  • Callosal dysgenesis
  • Neuronal heterotopia
  • Orofaciodigital syndromes, especially types I and II
  • Polymicrogyria
  • Trisomy-18