Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a mass in the left upper lobe measuring approximately 4 .2 x 3 .6 x 3 .5 cm concerning for malignancy . Otherwise the lungs appear clear . The cardiomediastinal silhouette appears normal . No large effusion or pneumothorax . Imaged bony structures appear intact .
    OUTPUT:
    
Left upper lobe mass measuring up to 4 .2 cm concerning for primary malignancy . Recommend CT to further assess .