KEY FACTS Terminology Intracranial lipoma (ICL) Mass of mature adipose tissue (congenital malformation, not true neoplasm) Imaging Well-delineated lobulated extraaxial mass with fat attenuation/intensity CT: -50 to -100 Hounsfield units (HU) (fat density); Ca++ varies from none to extensive MR:…
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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