Is CINE MRI necessary if blockage severe on regular MRI?

We’ve now had two different NS tell us that my 5 yr old’s CSF blockage is so apparent by regular MRI images that CINE MRI isn’t even necessary. They are both strongly advocating surgery based on severity of regular MRIs plus symptoms. I’m leaning towards surgery option as well. Would anyone still recommend that I push for CINE MRI anyway?