In penetrating injury from high-velocity missiles, injuries may occur not only from initial laceration and crushing of brain tissue by the projectile, but also from the subsequent cavitation. High-velocity objects create rotations and can create a shock wave that cause stretch injuries, forming a cavity that is three to four times greater in diameter than the missile itself.[1] A pulsating temporary cavity is also formed by a high-speed missile and can have a diameter 30 times greater than that of the missile.[2] Though this cavity is reduced in size once the force ends, the tissue that was compressed during cavitation remains injured.