quadrigeminal arachnoid cyst

Endoscopic

management of periventricular and intraventricular arachnoid cysts. a MRI T1 axial sequence showing quadrigeminal arachnoid cyst bulging inside the lateral ventricle in a 6-month-old male. b MRI T2 axial sequence after 1 month showing marked decrease in the size of the cyst and resolution of hydrocephalus with development of chronic subdural hygroma after performing endoscopic ventriculocystostomy and third ventriculostomy. c Follow-up CT after 3 months postoperatively showing reduction of the size of chronic subdural hygroma without intervention