Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Study is slightly limited due to a patient 's large body habitus . Moderate to severe cardiomegaly is re - demonstrated . Mediastinal and hilar contours are unremarkable . There is no pulmonary edema or large pleural effusion . Ill - defined opacity at the left costophrenic angle appears to persist when compared to the prior study , and is nonspecific . No definite new focal consolidation is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Limited exam due to large body habitus . Unchanged indistinct opacity projecting over the left costophrenic angle , possibly atelectasis but infection is not excluded .