title: Trapped fourth ventricle: a report of two unusual cases.
abstract: A trapped or isolated 4th ventricle presents as a posterior fossa mass lesion. It occurs in patients with prior lateral ventricular shunting and is diagnosed by computed tomographic scan. Two unusual cases are reported here.
mesh_terms: D001927:Brain Diseases / Q000209:etiology* / Q000601:surgery; D002552:Cerebral Ventricles / Q000601:surgery; D014695:Cerebral Ventriculography; D002557:Cerebrospinal Fluid Shunts / Q000009:adverse effects*; D002648:Child; D003388:Cranial Fossa, Posterior; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011183:Postoperative Complications; D014057:Tomography, X-Ray Computed