Inclusion Criteria:  Written informed consent Age ≥ 18 years Use of CranioFix®2 system according to IfU Planned postoperative MRI within clinical routine  Exclusion Criteria:  Pregnancy Patients with hypersensitivity to metals or allergies to the implant materials Inflammations in the region of the implant site Bone conditions that rule out the application of CranioFix®2 titanium clamps Use with artificial cranial bone flaps Bone tumors in the area supporting the implant Degenerative bone diseases Missing dura mater Application in the facial skull (viscerocranium) and in the orbital or skull-base region Combination of implant components from different manufacturers, i.e. additional use of plates and screws on the same bone fragment