Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates stable bilateral diffuse lung parenchymal opacities . The left apical pneumothorax is unchanged . Free air is seen beneath the bilateral hemidiaphragms . Known pneumomediastinum is better assessed on CT of the chest dated ___ . The cardiac silhouette is unchanged . Left upper extremity PICC ends in the low SVC .
    OUTPUT:
    
1 . Stable left apical pneumothorax . 2 . Free air in the abdomen . 3 . Stable bilateral parenchymal opacities consistent with multifocal pneumonia . 4 . Known pneumomediastinum is better assessed on CT of the chest dated ___ .