Which of the following is NOT a type of skull fracture?

The classification of skull fractures typically includes linear, depressed, and basilar fractures. Each of these types has distinct characteristics.

A linear fracture is a simple crack in the bone that does not displace or break the bone into fragments. It often appears as a thin line on imaging studies. A depressed fracture occurs when a portion of the skull is pressed inward due to trauma, which can potentially damage underlying brain tissue. A basilar fracture is a specific type of fracture at the base of the skull that may involve structures surrounding the brain and can have serious complications.

In contrast, a complex fracture is not an officially recognized category of skull fractures in medical literature. It may sometimes refer informally to fractures that involve multiple areas of the skull or have complex patterns, but it lacks a clear definition in the context of skull fracture classification. Thus, it is accurate to state that "complex" is not recognized as a formal type of skull fracture.