Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . Streaky left basilar opacity suggests minor atelectasis or scarring , not significantly changed aside from slight shifting morphology . The chest is hyperinflated . There is no pleural effusion or pneumothorax . Mild rightward convex curvature is centered along the lower thoracic spine . Projecting over the left mid lung is a small irregular opacity measuring 6 - 7 mm , potentially a nipple shadow not well seen on the more recent prior examination , but possibly a parenchymal nodule and not necessarily corresponding to small opacities over the area before , which were probably due to costochondral cartilage calcification which this does not resemble .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary disease . 2 . Small nodular opacity projecting over the left mid lung . This potentially represents a nipple shadow . An additional PA view with nipple markers may be helpful to confirm or refute the possibility . If the finding does not prove to represent a nipple shadow then CT imaging is suggested .