Toddler in a motor vehicle accident 2 months ago who still has a soft spot on the skull in the region of the fracture

Radiography of a growing skull fracture (leptomeningeal cyst)
3D CT reconstruction initially (left) showed a diastatic skull fracture which has increased in size on the lateral radiograph of the skull (right) taken 2 months later.

The diagnosis was a growing skull fracture / leptomeningeal cyst.