Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small ill - defined opacity in the left apex projecting between the posterior ___ and 4th ribs ; this is only seen on the PA view , and likely represents a vessel . No evidence of pneumonia , pleural effusions or pneumothorax . No pulmonary edema . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
1 . Small ill - defined opacity in left apex , likely representing a vessel . Would recommend follow - up CXR in 3 months . 2 . No acute cardiopulmonary process .