Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomegaly has not significantly changed . Lung volumes remain low with crowding of the bronchovascular markings particularly at the right lung base , not significantly changed from prior radiograph . There is thickening of the right pleural which may represent a small effusion . There is calcifications of the aortic knob . Left basilar opacity is present in was also seen on prior radiographs . There is no pneumothorax .
    OUTPUT:
    
1 . Low lung volumes with crowding of the bronchovascular markings . 2 . Persistent left basilar opacity , may represent atelectasis however superimposed infection can not be excluded . 3 . Mild cardiomegaly and a probable right pleural effusion .