Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate lungs are symmetrically expanded and clear . Bibasilar densities likely represent atelectasis . There is no focal consolidation , pleural effusion , or pneumothorax . Cardiomediastinal silhouette is stable . Degenerative changes in the thoracic spine are largely unchanged . Of note , a pulmonary nodule was noted in the right middle lobe measuring 6 mm on chest CT from ___ and remained stable in size on abdominal CT of ___ , but has not been followed up since .
    OUTPUT:
    
1 . No acute intrathoracic abnormality . 2 . 6 mm right middle lobe nodule has not been followed up since ___ .