Ventricals are typical MS. They also have certain characteristics. I am not sure what they are but the lesions look a certain way. Mine were in the ventricals and the Pons the brain stem.
Here is a link to the NMSS society tip sheet for McDonald Criteria (2010) for multiple sclerosis:
http://www.nationalmssociety.org/NationalMSSociety/media/MSNationalFiles/Brochures/Paper-TipSheet_-2010-Revisions-to-the-McDonald-Criteria-for-the-Diagnosis-of-MS.pdf
In the second row, it says dessimination in space can be proved by greater than or equal to 1 T2 lesion in at least two MS typical CNS regions
(periventricular, juxtacortical, infratorial, spinal cord)