Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an ovoid nodular opacity along the major fissure on the left , better evaluated on the CT torso performed on the same date , and corresponding to a pulmonary nodule in this location . A more diffuse opacity in the right upper lobe actually corresponds to callus formation around an old right first rib fracture as seen on the CT . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Left perifissural pulmonary nodule , better evaluated by the CT performed two hours earlier . Otherwise , no acute process .