Scores like these aren't common, but they do pop up now and again. I would expect a child who loves legos, building toys, any pre-engineering type activity, but can't really express himself verbally and is anxious/frustrated as a result. I think of it like holding a hand of cards in a card game - there is that 'Ace high' but nothing else in the suit to support it. I would use his impressive strengths in PRI to 'fun up' every other activity you hothouse with. If this doesn't describe your son, then I would say 'more tests.' Another interesting way to get a handle on your child is to take them to private schools and ask them "What do you see?" Even if you don't enroll, there is a lot to be learned. One commonly missed thing is enrichment in the strenghts.
How old is your son? Are there other family members with similar profiles? Remember that anxiety/depression or ADD could easily be depressing the VCI,WMI, or PSI - or even the PRI! This is just one snapshot of the child on one day.
Is any progress being made with the anxiety/depression or ADD?
Best Wishes,
Grinity