Case Notes
History
15 yo male with 1 week of severe headache, vomiting and blurred visionExam
MR sagittal plane
Prior Study
Noncontrast T1-wMR and T2-w spin-echo MR1. Nonaggressive appearing, large mass arising from the septum pellucidum in the body of the left lateral ventricle with inferior extension into the upper portion of the 3rd ventricle where it obstructs CSF flow at the iter portion of the cerebral aqueduct. The most likely pathologic consideration is central neurocytoma.
2. Grade 1.8/4 ventricular enlargement, which lacks transependymal fluid migration, and therefore despite the size of the lateral ventricles, this is not an acute progressive form of hydrocephalus. But rather this is a compensated form of hydrocephalus. Whether it is arrested or slowly progressive is indeterminate on a single exam.
3. There is a single small drop met in the right lateral ventricle.