Persistent trigeminal artery
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The tau sign refers to the unusual configuration of signal voids in the presellar ICA and in a persistent trigeminal artery, as viewed on parasagittal MR images.
The combination of the vertical and horizontal segments of the ICA and the proximal portion of the trigeminal artery creates the outline of the Greek letter "τ".
- 1. Goyal M. The tau sign. Radiology. 2001;220 (3): 618-9. Radiology (citation) - Pubmed citation
- 2. Osborn AG. Diagnostic neuroradiology. Mosby Inc. (1994) ISBN:0801674867. Read it at Google Books - Find it at Amazon