Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided Port - A - Cath tip terminates within the right atrium . The heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is not engorged . Trace left pleural effusion is present . There is no pneumothorax . Nodular density projecting over the fifth posterior rib medially measuring approximately 8 mm may lie within the bone or within the pulmonary parenchyma . Lungs are otherwise clear . No acute osseous abnormality is seen .
    OUTPUT:
    
Small left pleural effusion . No radiographic evidence for pneumonia . 8 mm nodular density projecting over the fifth left rib medially may represent an osseous lesion such as a bone island , or possibly a pulmonary nodule . Oblique views are recommended for further evaluation .