Overshunting-Associated Myelopathy (OSAM) in a Patient with Bilateral Jugular Vein Occlusion

OSAM has to be considered according to the Monro-Kellie doctrine and is affected by an engorgement of the epidural cervical venous plexus, which can produce cervical myelopathy. Because it can be treated simply by increasing the shunt resistance, surgeons should be aware of the rarely detected overdrainage complication.