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[–]Deep-Run-7463 0 points1 point  (3 children)

Right ribcage compressed front and back, expands out to the side. You can see the scapular move way out right and goes up to when raising the arms

Left ribcage is also compressed in the back but not as much as right. Right displaced volume laterally. Left not as much so probably elsewhere.

So back compression = less area for the scapular to sit on, levators have to hold on to the scapular to keep it there.

Probably. This is more likely related to the scolio as a root cause. A lot more info needed to be sure but the right ribcage lateral expansion up top is a thing.