MRI showing hemosiderin and other findings

My father, age 75, had brain MRI due to his diagnosis of cogntive decline and left homonymous hemianopsia.  The report found:
1. chronic hemosiderin staining of the left parietal occipital lobe and right anterior frontal lobe.  The findings likely reflect a remote insult, possibly traumatic in nature.
2. mild to moderate periventricular and subcortical white matter T2 hyper intensities, which is nonspecific but compatible with chornic microvascular and ischemic change.
3. No evidence of acute infarct, hemorrhage, hydrocephalus, abnormal intracranial enhancement or mass.
4.  Small chronic infarctg of the right postcentral gyrus.
5.  Left jugular bulb is slightly prominent wtih high signal, possibly secondary to slow flow.
6. Generalized parenchymal volume loss without hydrocephalus or midline shift.

My question:  my father has no history of head injury or falls to explain the hemosiderin.   He does have moderate alcohol use, but not an alcoholic.   What could cause the hemosiderin staining?  He is not aware of having any strokes.

Also, with the left jugular bulb, what does this suggest?

Any help appreciated!!

Gina