Fig. 1
From: Persistent idiopathic unilateral isolated hypoglossal nerve palsy – a report of two cases
a Right-sided atrophy along with tongue deviation 7 months after onset of symptoms. b Cisternal segment of the right hypoglossal nerve (HN) on 3D constructive interference in steady state (CISS) magnetic resonance imaging (MRI) showing normal appearance (white arrow). c Normal morphology of the skull base segment of the right HN inside of the right hypoglossal canal (HC) on 3D T1-weighted contrast enhanced (CE) MRI. The HN is of hypointense signal (white arrow), while the surrounding venous plexus shows prominent CE. d Axial computed tomography scan of the skull base demonstrating a normally appearing HC (white arrow). e Head and neck T1-weighted MRI demonstrates fatty infiltration and atrophy of the right half of the tongue due to chronic muscle denervation (white arrow)