Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Elevation of left hemidiaphragm is unchanged . Heart size is mildly enlarged , but potentially accentuated due to low lung volumes . Mediastinal contour is similar . There is crowding of the bronchovascular structures with possible mild pulmonary vascular congestion , but without overt pulmonary edema . Linear opacities within the left lung base likely reflect areas of atelectasis . No large pleural effusion is identified although the right costophrenic angle is excluded from the field of view . No pneumothorax is clearly seen .
    OUTPUT:
    
Limited exam with exclusion of the right costophrenic angle . Low lung volumes with left basilar atelectasis and possible mild pulmonary vascular congestion .