Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior film , there has been marked decrease in the size of the right sided pneumothorax . Tiny right apical pneumothorax remains visible . The pigtail catheter overlies the right mid lung laterally . Subcutaneous emphysema is again noted overlying the right chest . The cardiomediastinal silhouette is unchanged . Again seen is mild bilateral prominence of the pulmonary hila with a tapered appearance . Mild upper zone redistribution and vascular plethora similar to the prior film . Hazy densities project over both lungs , but given CT from 18 :00 last night , likely represent predominately artifact due to overlying soft tissues . Patchy retrocardiac opacity in the lingula and left lung base and in the right cardiophrenic region are similar to the prior film . No gross effusion .
    OUTPUT:
    
1 . Marked improvement in the right - sided pneumothorax , with a tiny residual right apical pneumothorax present . 2 . Mild upper zone redistribution and vascular plethora again noted , similar in degree . 3 . Patchy opacities at the left base could represent there is a focal infiltrate and / or aspiration . Changes at the right base are non-specific , but more suggestive of atelectasis .