Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Vague nodular opacities again seen projecting over the left lung base which may represent a nipple shadow . No convincing signs of pneumonia or CHF . No large effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Probable nipple shadow accounting for nodular opacity projecting over the left lung base . If needed repeat with nipple markers may be performed to confirm . No convincing signs of pneumonia .