Acquired cephaloceles, surgical. Acquired cephaloceles, surgical. A, AROP. Axial T2-weighted FSE image. Bilateral decompressive craniectomies have resulted in a “Mickey Mouse”-like herniation of brain into and through the calvaria.B, AROP. Axial T2-weighted FSE image. A posterior fossa decompressive craniectomy was complicated by a cephalocele. Cerebellar tissue, CSF, and meninges protrude through the surgical defect. Joel K. Curé et al. AJNR Am J Neuroradiol 2000;21:1110-1115 ©2000 by American Society of Neuroradiology