Slit ventricle syndrome refers to cerebrospinal fluid shunt-related symptoms in the setting of small ventricles demonstrated on radiologic studies.
The presence of characteristic symptoms is required to diagnose slit-ventricle syndrome and must be distinguished from slit-like ventricles, a radiologic finding.
Patients present with chronic intermittent headache, with or without neurologic signs or symptoms such as nausea/vomiting and altered mental status. The shunt reservoir refills slowly on palpation.
Mild forms are seen in adults and more severe forms are seen in children.
The exact etiology behind slit ventricle syndrome is debatable but likely is related to intermittent intracranial hypertension and hypotension. Various hypotheses have been proposed 3,4:
- intermittent ventricular isolation, in which one overdrained ventricle collapses and occludes the shunt catheter resulting in underdrainage of the contralateral ventricle
- noncompliant ventricles due to periventricular gliosis ("stiff ventricle"), which is unable to adapt to shunt malfunction (underdrainage), leading to intraventricular hypertension
- overdrainage leading to venous congestion, which decreases cerebral compliance and causes susceptibility to small changes in intracranial pressure
- capillary absorption laziness, in which the capillary-venous system in the setting of chronic overdrainage is less able to absorb variations in ventricular fluid pressures
- overdrainage in children leading to acquired craniocerebral disproportion (container-content mismatch) due to early suture ossification, resulting in intracranial hypertension
CT and MRI
Small ventricles with a characteristic slit-like appearance.
- 1. Jun, Byung Yoon, et al. "Slit Ventricle Syndrome." Journal of Korean Neurosurgical Society 16.4 (1987): 1241-1246.
- 2. Hyde-Rowan MD, Rekate HL, Nulsen FE. Reexpansion of previously collapsed ventricles: the slit ventricle syndrome. J. Neurosurg. 1982;56 (4): 536-9. doi:10.3171/jns.1982.56.4.0536 - Pubmed citation
- 3. Neurosurgical Emergencies. Thieme. ISBN:158890394X. Read it at Google Books - Find it at Amazon
- 4. Ros B, Iglesias S, Martín Á, Carrasco A, Ibáñez G, Arráez MA. Shunt overdrainage syndrome: review of the literature. (2018) Neurosurgical review. 41 (4): 969-981. doi:10.1007/s10143-017-0849-5 - Pubmed