Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: While there are increased interstitial markings throughout the lungs , the most striking abnormality is an opacity in the left upper lobe extending to the periphery of the lung where there is also a pleural based opacity in the area . There is retraction of the hila suggesting a chronic component . No pleural effusion is noted . No pneumothorax . Cardiac size is normal . The aorta slightly unfolded . A 7 mm nodular opacity is noted in the right upper lobe projecting over the mid clavicle but is likely calcified ; alternatively it may be a bone island . Attention on followup exam .
    OUTPUT:
    
Increased interstitial markings particularly in the left mid to upper lung with likely a chronic component given distortion of the left hilum . Superimposed acute infection or underlying mass lesion is also possible . Correlation with older films should they become available would be of use . Otherwise additional imaging such as followup chest x-ray after treatment ( if planned ) or CT scan at this time is suggested .