Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . On the lateral view there is a rounded density projecting over the lower thoracic spine , corresponding to a left paraspinal mass seen on prior CT . This lesion appears relatively stable dating back to prior radiograph from ___ , suggesting a benign entity . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . No signs of pneumonia . 2 . Stable paraspinal opacity dating back to ___ . Stability over time suggests a benign entity .