Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left heart silhouette and hemidiaphragm are obscured , and a meniscus fluid level is at the left costophrenic angle . No other focal consolidation , pulmonary edema or pneumothorax is seen . The cardiac and mediastinal contours are normal . Pigtail intra-abdominal drainage tube is seen within the left upper quadrant .
    OUTPUT:
    
Left pleural effusion and associated atelectasis , unable to rule out left basal pneumonia .