Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube appears to be in unchanged position . Lung volumes are low . Mild cardiomegaly with left ventricular predominance is re - demonstrated . Mediastinal and hilar contours are similar . There is crowding of bronchovascular structures with mild pulmonary vascular congestion , improved in the interval , without overt pulmonary edema . Patchy opacities in lung bases may reflect areas of atelectasis however infection or aspiration can not be completely excluded . Previously noted small left pleural effusion appears decreased or nearly resolved . No pneumothorax is demonstrated . A right - sided VP shunt catheter is again noted .
    OUTPUT:
    
Low lung volumes . Patchy bibasilar airspace opacities may reflect atelectasis , but aspiration or infection can not be excluded . Improved mild pulmonary vascular congestion and decreased left pleural effusion .