I’d rewrite #1 as “Hypermetabolic right perihilar mass consistent with lung cancer.”

This exam was not in comparison to an earlier study, therefore “increased hypermetabolic activity” is redundant.  Should just say “hypermetabolic acitivty” or “increased metabolic acitivity”. 

If comparing with a prior hypermetabolic lesion, could say “increased hypermetabolic activity” or “decreased hypermetabolic activity” to indicate the change. They both make me think about what the author is relaying; particularly “decreased hypermetabolic acitivity” which sounds like an oxymoron, although it is not.

(Of note; “hypermetabolism” = “hypermetabolic acitivity”. No need to use two words when one will do.)

I say, “more hypermetabolic” or “less hypermetabolic” to indicate a change.