School ager with a ventriculoperitoneal shunt who has had abdominal pain for a week and a headache for a day

CT of CSFoma / Cerebrospinal fluid pseudocyst
Axial CT without contrast of the abdomen shows a VP shunt in the anterior right abdomen that is coursing between two low density fluid collections and whose tip is in the fluid collection nearest to the midline.

The diagnosis was a ventriculoperitoneal shunt malfunction in the form of a CSFoma.