An unusual cause of back pain in a child: spinal subdural haematoma secondary to intracranial arachnoid cyst haemorrhage

Spinal subdural haematomas are rare entities which can occur secondary to trauma, clotting disorders, vascular malformations or iatrogenic procedures (1). Less commonly, a spinal subdural hematoma can have an intracranial origin, via gravity-dependent migration of blood into the spinal dural sac (2).