Fig. 9

Aneurysm/pseudoaneurysm in a 32-year-old female presenting with a lump over the palmar aspect of the right hand over 4 years. There was no prior invasive medical procedure although a vague history of trauma was obtained. (a) T1w sequence shows a well-circumscribed subcutaneous lesion with a central, relatively high signal (arrow) located superficial to the flexor tendons. (b) On T2w-FS sequence the lesion is hyperintense centrally with low signal at the periphery (arrow). (c) The low signal periphery corresponds to susceptibility artefacts on GRE sequence (arrow), compatible with thrombosis. (d) There is intense enhancement centrally. The peripheral thrombus is seen as a non-enhancing area. (e) MR angiogram shows the lesion to be arising from the region of the distal ulnar artery