Fig. 16From: Imaging in the diagnosis of ulnar nerve pathologies—a neoteric approacha Grey scale image showing characteristic fusiform swelling in continuity of the ulnar nerve, suggestive of peripheral nerve sheath tumour. b Hypointense lesion in continuity with ulnar nerve with fascicular pattern (yellow arrowheads) is seen with surrounding thin rim of fat (white arrow)—the split fat sign. c PD FS image shows a fusiform swelling which is hyperintense (red arrow) with internal hypointense areas, suggestive of collagenous stroma. Also noted is the ulnar nerve (yellow arrow) forming a tail. d Post contrast T1 FS image shows vivid enhancement in the PNST, differentiating it from a neuromaBack to article page