Case of the Week
Section Editors: Matylda Machnowska1 and Anvita Pauranik2
1University of Toronto, Toronto, Ontario, Canada
2BC Children's Hospital, University of British Columbia, Vancouver, British Columbia, Canada
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February 9, 2009
Epidermoid, Intraventricular
- Epidermoids represent 0.2-1% of all intracranial masses. They arise from inclusion of epithelial remnants trapped during 3-5 weeks of fetal life (remember that choroid plexus are also formed from invagination of ectodermal tissues).
- Intraventricular epidermoids are more in 4th ventricle followed by lateral ventricles.
- More common in middle age; very rare in children
- If ruptured, aseptic meningitis occurs.
- Long T1 and T2 are due to keratin in solid crystalline state. Epidermoids have restricted ADC and complex FLAIR signal, unlike arachnoid cysts.
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