Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The present portable chest examination is obtained with patient in supine position . Comparison is made with a similar preceding study of ___ . The previously identified marked widening of the superior mediastinum indicating the presence of a left - sided density occupying the apical area of the left hemithorax has regressed slightly . Previously described pleural densities along the left - sided lateral and lower chest wall remain rather unchanged . As this probably represents fluid in the pleural space , it also obliterates the diaphragmatic contour . The right hemithorax remains free , and there is no evidence of pulmonary vascular congestion or acute infiltrates in the right lung .
    OUTPUT:
    
Comparison with the next previous study suggests mild regression of left - sided superior mediastinal densities where stable appearance of pleural effusions is noted in the lower left hemithorax .