Hi Barby,
Were you dx'd with MS? Tell us more if you can.
-Shell
Punctate means tiny, subcortical means below the cortex, and deep white matter means deep within the white matter of the brain. A white matter lesion measuring up to 9 mm is definitely an indication of MS disease activity. It also sounds like it's oval, which is a classic sign.
The corpus callosum undersurface irregularity means that there's been some lesion activity in the corpus callosum - it 'chews' the surface of the callosum.
My guess is that you have MS with no active lesions. With or without active lesions you need treatment. JMO