PMC4901029_01
A. Axial T1-weighted image of the thumb (TR=500, TE 12) at the level of the proximal phalanx shows an intermediate signal mass in the ulnar soft tissues (arrows). B. T1-weighted axial image through the thumb just distal to the mass shows an enlarged digital nerve (arrowhead) compared to the normal radial digital nerve (open arrow). C. The tubular configuration of the mass (arrows) can be seen on T1-weighted coronal image through the thumb. D. The mass (arrows) is very low in signal on fat-saturated FSE T2-weighted (TR=5500, TEeff=90) axial image.
gr1.jpg
PMC4901029_01_gr1.jpg
fig1
A fusiform mass was identified at the medial aspect of the thumb (Fig. 1), measuring 1.2 x 1.2 x 2.3 cm, that demonstrated intermediate signal on
A. Enlarged ulnar digital nerve (arrows) is surrounded by perineural fibrosis producing irregular rather than normal smooth contour. B. The nerve is smaller and has a smoother contour following neurolysis.
gr2.jpg
PMC4901029_01_gr2.jpg
fig2
At surgery, the ulnar digital nerve was markedly enlarged secondary to perineural fibrosis (Fig. 2).