Final Answer:
The pancreas is an organ that cannot be seen on a KUB (Kidney, Ureter, Bladder) X-ray.
Step-by-step explanation:
A KUB X-ray is a radiographic examination that focuses on imaging the kidneys, ureters, and bladder. It is particularly useful for assessing the urinary system and identifying issues such as kidney stones or structural abnormalities. However, the pancreas, being located in the upper abdomen behind the stomach, is not typically visible on a KUB X-ray due to its position and the limited scope of the imaging study. To visualize the pancreas, other imaging techniques such as a CT scan or MRI that offer more detailed views of the abdominal organs are generally employed.