Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity at the left costophrenic angle , which may represent atelectasis . However , it is more consolidative in appearance on the lateral view , and suspicious for pneumonia . No pleural effusion or pneumothorax . Cardiomediastinal contours are normal . No acute osseous abnormalities identified .
    OUTPUT:
    
Small dense opacity at the left costophrenic angle , may represent atelectasis , but pneumonia should be considered if the patient has infectious symptoms .