Fig. 1.

Postvenipuncture in-continuity neuroma. a–c Transverse sonograms obtained from proximal (a) to distal (c) at the lateral aspect of the distal forearm in a patient with Wartenberg syndrome following catheterisation of the cephalic vein (curved arrows). At this level, the superficial branch of the radial nerve is composed of two small branches (white arrowheads), which show a normal appearance in (a). In b, at the level of the venipuncture, the medial branch (black arrowhead) is swollen and hypoechoic and very painful at local pressure. The findings are typical of an in-continuity posttraumatic neuroma. Note the normal appearance of both branches distal to the site of traumatism (c)