Bone flap resorption is one of the major complications after autologous skull repair. The incidence of flap resorption varies widely in the literature, with postoperative resorption rates ranging from 1.4% to 50%, with severe flap resorption rates ranging from 0.8% to 20%. Autologous bone flaps begin to show signs of flap resorption on CT images 2 months after repair and stabilize 18 months after repair, so follow-up for at least 18 months is often required. Cranial resorption has 3 types of manifestations on CT images: 1) thinning of the bone flap thickness and widening of the bone window-flap spacing; 2) decreased bone density of the bone flap; and 3) local or extensive destruction (or dissolution) of the bone flap. The scalp manifestations of patients after resorption can be depression of the skin edge, revealing the morphology of the skull, and also the bone flap may float, and pressure is a fluctuating sensation, reducing or even losing the protective effect. Therefore, the application of autologous bone is not recommended.