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It does not sound to be consistent or suspicious of brain tumor to me. Does he have headaches? Migraines? A migraine may go through phases of vascular constriction (visual symptoms common here) and dilation( throbbing type headache common here)
Many migraine patients may have visual symptoms as a prodrome to headache. Many may be sensitive to smells as possible trigger.. Some migraine patients sensitive to certain perfumes for example...
So I would advise further follow up with neurologist that has part I ular emphasis within their practice on migraines.
If the visual symptoms are frequent I think he may benefit from a migraine prevention treatment such as Topomax or Elavil or Inderal...
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Anthony Bray MD