Schwannoma MRI

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: ; Maneesha Nandimandalam, M.B.B.S.[2]

MRI

Schwannomas have fairly predictable signal characteristics :

• T1: isointense or hypointense
• T1 C+ (Gd): intense enhancement
• T2: heterogeneously hyperintense (Antoni A: relatively low, Antoni B: high)
  • cystic degenerative areas may be present, especially in larger tumors
• T2*: larger tumors often have areas of hemosiderin

A number of signs can also be useful:

• split-fat sign: thin peripheral rim of fat best seen on planes along long axis of the lesion in non-fat-suppressed sequences
• target sign
  • peripheral high T2 signal
  • central low signal
  • rarely seen intracranially 7
• fascicular sign: multiple small ring-like structures