Isolated hypoglossal nerve palsy due to internal carotid artery dissection

(A) The patient's tongue deviated to the left.
(B) T1-weighted MRI demonstrates narrowing of the lumen and intramural hematoma in the left internal carotid artery.
(C) True fast MRI with steady-state precession reveals the anatomic juxtaposition of the hypoglossal nerve (arrowhead) and the dissected internal carotid artery (arrow).