Abstract
1080
Learning Objectives 1. To understand CSF dynamics, ventricular shunt designs and significance of CSF nuclear shunt studies. 2. To understand the normal patent CSF shunt study. 3. To recognize the various scintigraphic patterns of shunt malfunction
Summary: CSF shunts are used to treat obstructive communicating and non-communicating hydrocephalus. Malfunction of the shunt might present with specific or non-specific CNS symptoms. The radionuclide CSF shunt study may be used as the primary exam for shunt patency or in cases where the conventional radiological exam is equivocal. Shunt patency is indicated by the diffuse activity distally (right atrium, peritoneal cavity or pleural cavity) within minutes of the radionuclide injection.Malfunction of the shunt can occur proximally, distally, at the reservoir or the valve and present as ventricular reflux with delayed clearance, spinal activity, obstruction at reservoir, absence of activity in the peritoneum, loculated collection or delayed transit on a radionuclide CSF shunt study. Scintigraphic illustrations of shunt malfunction would be provided along with clinical information and correlative radiological imaging in comparison to a normal patent CSF shunt study.
- © 2009 by Society of Nuclear Medicine