Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exams from ___ and ___ . There are persistent bibasilar opacities , left greater than right . Superiorly , the lungs are clear . Cardiomediastinal silhouette is unchanged . Anterior and posterior lower cervical and upper thoracic spinal hardware is identified . No acute osseous abnormality is detected . Mild upper - to - mid thoracic compression deformity is unchanged .
    OUTPUT:
    
Bibasilar opacities suggestive of atelectasis , noting that aspiration or infection particularly on the left can not be excluded .