Falx and cavernous sinus fat

Case contributed by Dr Andrew Dixon

Presentation

Fall with head strike.

Patient Data

Age: 80
Modality: CT

Normal small deposit of fat within the anterior portion of the falx and posterior portions of both cavernous sinuses. 

Case Discussion

It is not uncommon for small deposits of fat to exist intracranially within the falx and around the cavernous sinuses. With standard CT brain window settings these fat deposits appear black and can be misinterpreted as being air (pneumocephalus) by the inexperienced reader. If there is any doubt, switching to lung or bone windows will allow the density difference between air and fat to be readily appreciated, as fat will turn grey and air will stay black. 

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Case Information

rID: 45334
Case created: 22nd May 2016
Last edited: 24th May 2016
Inclusion in quiz mode: Excluded

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