Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable chest radiograph demonstrates unremarkable mediastinal , hilar and cardiac contours . Lungs are clear . Density noted at the cardiac apex is present across multiple prior studies and corresponds with prominent pericardial fat pad noted on the ___ chest CTA . No osseous abnormality identified .
    OUTPUT:
    
No acute intrathoracic process .