<unk>  is a rare malformation consisting of absence of the<unk> l bones, dura mater and associated muscles in the presence of a normal skull base and normal facial bones. The central nervous system is usually unaffected. The presumed pathogenesis of<unk>  is faulty migration of the membranous neurocranium with normal placement of the embryonic ectoderm, resulting in absence of the<unk>  but an intact layer of skin over the brain parenchyma. In other words, instead of having a skull cap protecting the brain, there is only skin covering it. The size of the area that is missing the skull cap can vary from case to case. In extreme cases, the entire top part of the cranium that is dome-shaped may be absent.
Acalvaria
Pinguecula
Epiblepharon
Euryphon
Ranula
Symblepharon
Protruding ear
Otic pit