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A compound elevated skull fracture is a rare type of skull fracture where the fractured bone is elevated above the intact outer table of the skull. This type of skull fracture is always compound in nature.
Fractures of the dens, not to be confused with Hangman's fractures, are classified into three categories according to the AndersonâD'Alonso system: 1  Type I Fracture - Extends through the tip of the dens. 2  Type II Fracture - Extends through the base of the dens. 3  Type III Fracture - Extends through the vertebral body of the axis.