Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left subclavian central venous line terminates in the upper SVC . The study is slightly limited secondary to rotation . Obscuration of left hemidiaphragm and opacification of the retrocardiac region represents persistent left lower lobe collapse . Layering effusion of the left lung in conjunction with known multiple left rib fractures is concerning for growing pneumothorax , although may be due to supine positioning . The right lung is essentially clear with heterogeneous right basilar opacity which may represent atelectasis .
    OUTPUT:
    
Layering effusion of the left lung with adjacent rib fractures raises the concern for growing hemothorax . Dedicated upright chest radiograph can be obtained to evaluate for true size of left pleural effusion rather than apparent increase in size due to supine positioning .