Quadrigeminal Cistern Lipoma

quadrigeminal cistern lipoma

This patient was scanned for possible temporal lobe epilepsy - an incidental fatty mass of the quadrigeminal cistern was identified.

Quadrigeminal cistern lipomas make up approximately 10 - 25% of all intracranial lipomas, and may be associated with hypoplasia of the inferior colliculi or agenesis of the corpus callosum.

The differential includes:

  • thrombosed berry aneurysm - often will have calcified rim, and haemosiderin staining.
  • white epidermoid - rare, and will restrict on DWI
  • intracranial dermoid - if ruptured will often have multiple droplets.
  • intracranial teratoma
  • lipomatous transformation of neoplasm - PNETs, ependymomas, gliomas

For more images of the same case please visit Radiopaedia.org here.

References:
1. L.A. Loevner Brain Imaging - Case review
2. StatDx.com

Credit: Dr Frank Gaillard