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A 32 year-old woman developed right sided neck pain after a minor care accident. A right sided Horner's sign was present.
MRI - Axial fat suppression images of the lower brainstem. Note the bright signal in the right internal carotid area. The bright signal is blood, indicating a dissection of the carotid artery. Due to collateral flow at the circle of Willis, dissection do not usually cause strokes by lack of blood flow, but rather from emboli have travel downstream and occlude the MCA, ACA or one of their branches.
The Electronic Curriculum is copyrighted 1998, Case Western Reserve University School of Medicine.