What might results of brain ct scan indicate?

I'm not a doctor but I have a masters in psychology and have a hobby of learning about pharmaceutical and brain science. I can give you a little detail on these results, but my first piece of advice is to discuss these results with the doctor/neurologist that did the scan.

White brain matter refers to the neurons that connect the grey matter in the brain (essentially service as the connection between different areas of the brain). These nerve cells serve the brain communication by speeding it up. Reduction in white matter indicates a decrease in the speed of brain communication, therefore the decrease in thinking speed. Common illnesses associated with decreased white matter are autism and vascular dementia.
The second portion of this I think you mean full sacral prominence...the sacrum is the bone at the base of the spine, which to me means that the decrease in white matter includes the spinal column...indicating that it is widespread. Another connection of the sacrum to brain science is that there is a term called cranio sacral therapy that supports the use of chiropractic therapy to reduce pain and increase thought processes.
Enlarged ventricles imply that there is increased fluid in the brain. This is sometimes called normal pressure hydrocephalus when it is chronic. It can be caused by aging and affects control of the lower body (legs, bladder, etc) as well as cognitive processes. It has a relation to vascular dementia.
Calcification of the cartoid artery means that the artery has hardened usually by plaques and can indicate a higher risk of stroke. Complete blockage of this artery is a stroke. Ironically it is also connected to white matter problems.
Calcifaction of the left lobe can cause right side weakness/shrinking and epilepsy/seizures. It can also affect eyesight.
Overall I would expect someone with this scan to be eventually diagnosed with vascular dementia by a neurologist.
Angel

Um. Myself, I'd ask the radiologist who did the CT scan. They're usually only too happy to discuss how brilliant their imaging is :)

Thank you Angel. That makes so much sense given his complex medical history. He is a 79 year old alcoholic liver transplant; cirhosisx2, ckd3, atherosclerosis,copd, and more. You mentioned fluid and I wondered if this might have any relation to "wet brain"/ korsokiff syndrome as well. I really appreciate your insight. My situation is very complex and ugly and would take too long to explain. Best to you.

Thank you country mouse. I can't as I no longer my dads hcp. I'm working through agencies and around the roadblocks to make sure he continues to get the care and attention he needs.