Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in upright position . Comparison is made with a next preceding similar study of ___ . There is further clearance of the previously described remaining bilateral basal densities that represented pleural effusions following an episode of CHF . The diaphragms are now visible but only remaining mild blunting of the left lateral pleural sinus . The right - sided pleural sinus is free . There is no evidence of new acute pulmonary infiltrates of pneumonic appearance . No pneumothorax is present in the apical area . A left - sided subclavian approach central venous line remains in unchanged position .
    OUTPUT:
    
Further improvement in bilateral pleural effusions . No evidence of new acute pneumonic infiltrate on this portable AP single view chest examination .