This case demonstrates an intraparenchymal pericatheter cyst, a rare complication of ventriculoperitoneal shunt failure, with few case reports.

Initially thought to represent encephalomalacia secondary to old infarct. MRI in fact demonstrates a well defined pocket of cerebrospinal fluid around the point of shunt disconnection. Patient underwent neurosurgery for a successful ventriculoperitoneal shunt replacement. Intraoperatively the ventricular catheter was found disconnected from the valve.

Important complication for radiologists to be aware of.