Which term refers to a slight break in a bone that appears as a slight fissure in an X-ray?

The term that refers to a slight break in a bone that appears as a slight fissure in an X-ray is "greenstick." This type of fracture is characterized by the bone bending and partially breaking, resembling a green twig that bends and cracks but does not break completely. It is most commonly seen in children due to their softer and more flexible bones, making them more susceptible to this type of injury.

Other terms, while relevant to different types of fractures, do not accurately describe this specific type of bone injury. A nondisplaced fracture refers to a break where the bone fragments remain in their normal position, which can include more than just a fissure. A spiral fracture involves a twisting force that causes an angled break, leading to a more complex fracture pattern rather than just a fissure-like appearance. Colles' fracture typically refers to a specific type of distal radial fracture caused by falling on an outstretched hand, which would also not match the description of a slight fissure.