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Rhombencephalosynapsis with massive hydrocephalus: case report and pathogenetic considerations.
1Department of Pathology, Immunology and Laboratory Medicine, University of Florida Brain Institute and College of Medicine, P.O. Box 100275, Health Science Center, 1600 S.W. Archer Road, Gainesville, Florida 32610, USA. yachnis@pathology.ufl.edu
Acta Neuropathologica
|March 22, 2002
Summary
Rhombencephalosynapsis (RS) is a rare cerebellar malformation. This case report details a patient with RS, highlighting its complex associated anomalies and potential embryological origins.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Rhombencephalosynapsis (RS) is a rare congenital cerebellar malformation.
- It is characterized by agenesis/hypogenesis of the cerebellar vermis, fused cerebellar hemispheres, and fused dentate nuclei.
Observation:
- This report details a 29-year-old female with profound intellectual disability and chronic hydrocephalus.
- Autopsy revealed massive hydrocephalus, aqueductal stenosis, small cerebellum with vermian aplasia, fused cerebellar hemispheres, fused middle cerebellar peduncles, small fourth ventricle, fused inferior colliculi, and absent dorsal olivary nuclei.
Findings:
- The observed spectrum of anomalies is consistent with Rhombencephalosynapsis.
- These findings suggest a potential embryological defect in dorsal patterning affecting the isthmic organizer.
Implications:
- Further molecular analysis of dorsalizing genes like Lmx1a may identify mutations specific to RS.
- Understanding the genetic basis of RS can improve diagnosis and potential therapeutic strategies for cerebellar malformations.