Idiopathic @entity850 of the foramina of Magendie and Luschka is a rare cause of obstructive @entity1276 involving the four ventricles. Like other causes of noncommunicating @entity1276 , it can be treated with endoscopic third ventriculostomy (ETV). Three @entity1 who were 21, 53, and 68 years of age presented with either @entity10 (isolated or associated with @entity428 ) or vertigo, or a combination of gait disorders, @entity74 , and disorders of higher functions. In each case, magnetic resonance (MR) imaging demonstrated @entity1276 involving the four ventricles (mean transverse diameter of third ventricle 14.15 mm; mean sagittal diameter of fourth ventricle 23.13 mm; and mean ventricular volume 123.92 ml) with no signs of a Chiari @entity600 (normal posterior fossa dimensions, no herniation of @entity76 ). The diagnosis of obstruction was confirmed using ventriculography (in two @entity1 ) and/or MR flow images (in two @entity1 ). All @entity1 presented with marked dilation of the foramen of Luschka that herniated into the cisterna pontis. All @entity1 were treated using ETV. No complications were observed. All three @entity1 became asymptomatic during the weeks following the surgical procedure and remained stable at a mean follow-up interval of 36 months. Postoperative MR images demonstrated regression of the @entity1276 (mean transverse diameter of third ventricle 7.01 mm; mean sagittal diameter of fourth ventricle 16.6 mm; and mean ventricular volume 79.95 ml), resolution of dilation of the foramen of Luschka, and good patency of the ventriculostomy (flow sequences). These results confirm the existence of @entity1276 caused by idiopathic fourth ventricle outflow obstruction without an associated Chiari @entity600 , and the efficacy of ETV for this rare indication.

@entity1276 due to idiopathic XXXX of the foramina of Magendie and Luschka. Report of three cases.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity850 :: ('MESH:D003251', 'Disease') :: ['stenosis'] @entity1276 :: ('MESH:D006849', 'Disease') :: ['hydrocephalus'] @entity428 :: ('MESH:D019586', 'Disease') :: ['raised intracranial pressure'] @entity600 :: ('MESH:D000014', 'Disease') :: ['Type I malformation'] @entity74 :: ('MESH:D030342', 'Disease') :: ['sphincter disorders'] @entity76 :: ('MESH:D002526', 'Disease') :: ['cerebellar tonsils'] @entity10 :: ('MESH:D006261', 'Disease') :: ['headaches']
@entity850 :: (MESH:D003251,Disease) :: ['stenosis']
