Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates opacity which is subtle at the right lung base medially , new since prior examination . Remaining lungs appear clear . There is been interval removal of a right PICC . There is no pneumothorax or pleural effusion . Cardiomediastinal and hilar contours are within normal limits . There is no evidence of pulmonary edema . There is no air under the right hemidiaphragm .
    OUTPUT:
    
A vague opacity in the right lung base is new since prior study , nonspecific and potentially atelectasis , in the appropriate clinical setting may represent early infectious process .