The U.S. is a society driven by media. Gruesome often brings in viewers and readers. Medical malpractice stories involving surgery on the wrong body part or leaving behind a tool in a patient are undoubtedly horrifying. Maybe that is why the public tends to think of such cases when presented with the topic of hospital negligence.
One of the great benefits of modern medicine is the ability to detect many types of cancer at an early stage. Although some cancer screenings can be uncomfortable, they often prevent patients from finding out too late that they have a life-threatening illness. But for the screenings to be effective, they must be properly analyzed. A test that reveals the presence of cancer cells doesn't do a patient any good if a medical professional doesn't recognize the problem.
When a patient goes to see a doctor, the patient relies on the doctor. There is a certain standard of care that patients expect from medical professionals. But when a doctor or nurse is negligent in providing care, the patient could suffer serious harm as a result of a mistake.