Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an ill - defined left upper lung mass measuring approximately 3 .7 x 2 .7 cm with spiculated margins , corresponding to the mass seen on prior CT . There is no consolidation , pleural effusion , or pneumothorax . The lung are hyperexpanded and the diaphgrams flattened , consistent with pneumonia . The sclerotic right rib noted on prior CT is not well visualized on this modality .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . 3 .7 - cm left upper lung mass is better evaluated on prior CT on ___