Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation to suggest pneumonia . There is no pleural effusion or pneumothorax seen . The heart size is normal , and the mediastinal silhouette is unremarkable . Within the left lower lung , there is an ill - defined , rounded ___- mm opacity , best appreciated on the frontal view , overlying the left ninth rib posteriorly . Mild degenerative changes of the right acromioclavicular joint are noted .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Nodular opacity within the left lower lung is not fully characterized on this study . Comparison to prior films or dedicated chest CT on a non-emergent basis is recommended . These findings were discussed with Dr . ___ by Dr . ___ on ___ at ___ via telephone .