Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . Opacities within the lung bases , left greater than right , is unchanged compared to recent prior examination and may reflect persistent atelectasis or resolving aspiration as suggested by the clinical history . Mild blunting of the left costophrenic angle suggests persistent small effusion . The upper lungs appear clear . A known 14 mm left lower lobe pulmonary nodule is not well seen on this radiographic examination . There is no pneumothorax . No vascular congestion or overt pulmonary edema is identified . Cardiomediastinal and hilar contours appear within normal limits and unchanged from prior .
    OUTPUT:
    
1 . Low lung volumes . Unchanged bibasilar opacities and probable small left pleural effusion . Differential includes chronic atelectasis or aspiration or infection depending on clinical situation . Given low lung volumes , PA and lateral views may be helpful for further evaluation , if patient able . 2 . No new focal consolidation , pneumothorax , or pulmonary edema .