Neuro_MR_Brain: 10 F, AMS.
MRI BRAIN WITH AND WITHOUT CONTRAST:
CLINICAL HISTORY: 8 years of age, female, posterior fossa tumor.
There is a
lobulated, T2 hyperintense mass centered on the fourth ventricle
extending into the subarachnoid space through the foramina of Luschka and Magendie, and expanding the obex, with small cysts in the superior aspect. Inferior aspect of mass extends to the C1-C2 level, and extends laterally into the
left greater than right premedullary cisterns
encasing multiple vessels including left PICA. Mass demonstrates
patchy areas of enhancement
without reduced diffusivity
. Mass measures 5.1 x 4.0 x 4.9 cm (AP by ML by CC). Mass results in obstructive hydrocephalus of the fourth ventricle with resultant moderate dilatation of the lateral and third ventricles with
optic pathway edema
. No additional lesions seen in the brain. No evidence of leptomeningeal spread.
1. Fourth ventricular mass extending into the foramina of Luschka and Magendie, with resultant ventriculomegaly and tumor surrounding/deforming the medulla and the upper cord. Findings likely represent ependymoma rather than other tumor types.
(Posterior fossa ependymoma)
Study description: MRI BRAIN W AND WO CONTRAST