Hypoperfusion means less than normal blood flow. Mild suggests it shouldn't be a big concern.

There is plenty of online descriptions of parietal lobe functions and dysfunctions. Honestly, I suggest you NOT research the parietal lobe. Many will see a long list of possible symptoms and soon some of those symptoms start manifesting. This can hamper proper diagnosis and treatment because the doctor has to sort between the real physical symptoms and those that the mind has exaggerated through the power of suggestion.

I strongly recommend you adopt behaviors to reduce neck symptoms, especially sleep posture. Inflammation in the neck, especially upper neck can reduce some of the blood flow to the brain. I had a serious problem with this for a few years until I resolved my neck.