Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single semi-erect portable chest radiograph demonstrates no focal opacity convincing for pneumonia . Cardiomediastinal and hilar contours are stable in appearance . The right costophrenic angle is incompletely imaged . No overt pulmonary edema . No large effusion is appreciated . A trach is identified terminating 2 .8 cm above the level of the carina . No acute osseous abnormalities detect appear
    OUTPUT:
    
No convincing evidence of pneumonia .