Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is within normal limits . A small wedge - shaped area of opacification along the left hemidiaphragm is new compared to the prior examination . Lungs are otherwise clear . There is no pleural effusion or pneumothorax . Bones are grossly unremarkable .
    OUTPUT:
    
A small wedge - shaped area of opacification at the left base along the hemidiaphragm is new compared to the prior examination and may reflect atelectasis however the possibility of an infarct or mass can not be entirely excluded and followup in ___ weeks is recommended to ensure resolution . At time of follow - up , the radiologist should be consulted before the patient leaves the department to determine if oblique images would be required .