Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal chest radiograph demonstrates unremarkable mediastinal and hilar contours . Heart size is top normal with a configuration suggesting left ventricular hypertrophy . Lungs are clear . No pleural effusion or pneumothorax identified . No osseous abnormality is present .
    OUTPUT:
    
No acute intrathoracic process .