Growing skull fracture


Leptomeningeal cysts, also known as growing skull fractures, are an enlarging skull fracture that occurs near post-traumatic encephalomalacia.

The exact pathogenesis remains unclear, but it is thought they occur secondary to skull fractures causing dural tears, allowing the leptomeninges and/or cerebral parenchyma to herniate into it. Pulsations from CSF erode the fracture margin, resulting in eventual expansion and non-union.