Contracting skull

The eggshell rule (also thin skull rule or talem qualem rule) is a well-established legal doctrine in common law, used in some tort law systems, with a similar doctrine applicable to criminal law. The rule states that, in a tort case, the unexpected frailty of the injured person is not a valid defense to the seriousness of any injury caused to them. [Source: Wikipedia ]

Postinflammatory or posttraumatic cerebral degeneration
May Cause
Small sella turcica
May Be Caused by
Cerebral atrophy in childhood