Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show persistent retrocardiac opacification and minimal blunting of the left costophrenic angle consistent with substantial left lower lobe atelectasis or consolidation due to pneumonia unchanged or slightly increased from ___ . A small left pleural effusion is also present . The right lung is relatively clear . The inspiratory lung volumes are low . The pulmonary vasculature is not engorged . The cardiac silhouette is enlarged with a left ventricular configuration , but unchanged from prior studies . Small rounded densities overlying the left upper chest correspond to small bone islands seen in the anterior ribs on prior CT of ___ .
    OUTPUT:
    
1 . Persistent left lower lobe atelectasis or consolidation from ___ . 2 . Stable cardiomegaly .