dermoid / epidermoid tumor

• congenital ectodermal tumor
• stratified squamous capsule secretes cholestrine + desquamated cells

• site:
  • petrous apex / CPA (most common)
  • suprasellar cistern (parasellar mass)
  • cerebral hemisphere
  • cerebellum / 4th ventricle

• CT:
  • low density (d/t fat content); occ. high density
  • no enhancement
  • extra-axial

© 2002, C.E. Kahn, Jr.
2002-04-18