Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new 2 cm poorly defined nodule in left upper lobe anteriorly is suspicious for a pulmonary malignancy . Alternatively , this may represent developing pneumonia in correct clinical setting . There is no pleural effusion or pneumothorax . Cardiomediastinal and hilar silhouettes are normal size . Tortuous contour of ascending aorta is stable .
    OUTPUT:
    
New 2 cm poorly defined nodule in left upper lobe is suspicious for a pulmonary malignancy in the absence of infectious symptoms . Alternatively this may represent developing round pneumonia in correct clinical setting .