Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest demonstrate well expanded lungs with prominent interstitial markings bilaterally . A very small pneumothorax remains , now this has improved since previous imaging . Right pigtail catheter is seen again in place in the right lower chest . Left pleural effusion is again seen , unchanged from prior imaging . Again seen is a collapsed lower thoracic vertebra which appears to be chronic since at least ___ . Other visualized osseous structures are unremarkable .
    OUTPUT:
    
Persistent prominent interstitial markings . Resolving pneumothorax . Unchanged left pleural effusion .