Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal and without change . Within the lungs , a small opacity has developed in the periphery of the left lower lobe , partially obscuring a small portion of the left hemidiaphragm . An adjacent linear opacity is seen peripherally just above this level . No pleural effusion , pneumothorax , or acute , displaced rib fracture is evident .
    OUTPUT:
    
Nonspecific peripheral left lower lobe opacity , which could be due to localized atelectasis or an early focus of pneumonia . In the appropriate clinical setting , a pulmonary infarct is an additional consideration . Findings communicated by phone to Dr . ___ by telephone on ___ at 10 :30 a .m . at the time of discovery .