Final answer:
The statement is false; radiographs can show Pancoast tumors, although CT scans or MRI are used for more detailed imaging.
Step-by-step explanation:
The statement "radiographs cannot show Pancoast tumors" is false. A Pancoast tumor is a type of lung cancer that occurs at the top of the lung and can affect surrounding structures. While radiographs, also known as chest X-rays, might not always show the tumor in great detail, they can often provide the first indication of a mass in the lung apices. For a more definitive diagnosis and better visualization, computed tomography (CT) scans or magnetic resonance imaging (MRI) are typically used. These imaging modalities can provide detailed images of the lung's anatomy, revealing the presence and extent of a Pancoast tumor.