Swallow tail sign...
Axial Illustration 2
Swallow tail sign is representing the normal appearance of nigrosome 1 within the substantia nigra posterior third. The high signal intensity of nigrosome 1 bordered by hypointense signal of substantia nigra looks like the tail of a swallow as represented.
Section: Signs
Modality: MRI (Illustration 2)

- “ Illustrations courtesy of Dr. Afra Alfalahi ”

Used in the following article:

  • Swallow tail sign (substantia nigra) - “ The swallow tail sign describes the normal axial imaging appearance of nigrosome-1 within the substantia nigra on high resolution T2*/SWI weighted...”

View full size version of Loss of swallow tail sign in Parkinson disease

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