KEY FACTS Terminology Partial or complete absence of corpus callosum (CC), hippocampal commissure, or anterior commissure (AC); can be isolated or associated with additional cerebral malformations Spectrum of congenital CC structural abnormalities Total agenesis (absence from birth of all anatomically…
KEY FACTS Terminology Complex hindbrain malformation Virtually 100% associated with neural tube closure defect, usually lumbar myelomeningocele (MMC) Imaging Crowded posterior fossa, widened tentorial incisura, tectal beaking, inferior vermian displacement Cascade or waterfall of cerebellum/brainstem downward Uvula/nodulus/pyramid of vermis →…
KEY FACTS Terminology Chiari 1 malformation (CM1): Constellation of findings (not disease, not simply measurement) No clear consensus definition of what constitutes CM1 Traditional: Elongated, peg-shaped cerebellar tonsils extend below foramen magnum (FM) into upper cervical spinal canal 5-mm criterion…
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KEY FACTS Terminology Benign mesenchymal tumor containing variable amounts of smooth muscle (myoid), fat (lipoid), and proliferating blood vessel (angioid) components You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If…
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KEY FACTS Imaging Key features (not always present): Hypervascular, fat-containing, hemorrhagic, encapsulated MR shows some elements better than CT (lipid & hemorrhage) T1WI: Mass: Heterogeneous signal intensity – Increased signal intensity (due to fat or recent hemorrhage) – Decreased signal…
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