1. Naidich TP, Altman NR, Braffman BH, McLone DG, Zimmerman RA (1992) Cephaloceles and related malformations. AJNR Am J Neuroradiol 13:655–690
2. James CCM, Lassman LP (1972) Spinal dysraphisms: spina bifida occulta. Butterworths, London, pp. 89–97
3. Commens C, Rogers M, Kan A (1989) Heterotropic brain tissue presenting as bald cysts with a collar of hypertrophic hair. The ’hair collar’ sign. Arch Dermatol 125:1253–1256
4. Drapkin AJ (1990) Rudimentary cephalocele or neural crest remnant? Neurosurgery 26:667–674
5. Inoue Y, Hakuba A, Fujitani K, Fukuda T, Nemoto Y, Umekawa T, et al. (1983) Occult cranium bifidum. Radiological and Surgical Findings Neuroradiology 25:217–223