Differentiating atelectasis vs tension pneumo

I thought right side was atelectasis but apparently this was tension pneumothorax in a child. Can someone give me pointers on differentiating between the two? https://preview.redd.it/gnoyx365t31b1.png?width=683&format=png&auto=webp&s=6a64f3954987f859ac5be530d687b0540cb1ae85 submitted by /u/nia5095 [link] [comments]

source https://www.reddit.com/r/Radiology/comments/13nhm2z/differentiating_atelectasis_vs_tension_pneumo/