The ulnar artery pseudoaneurysm

Abstract

Three years following a blunt injury to his hand, a 44-year-old man presented with a persistently painful focal area of his left palm at the base of his thumb. Physical examination revealed a small painful pulsatile mass at the base of his left hypothenar eminence. His radial pulse was normal and he had a normal capillary refill of his ulnar and radial-sided digits. There was no evidence of digital ischaemia. MRI demonstrated a saccular outpouching at his distal ulnar artery (figure 1A, arrow), which on Doppler ultrasound demonstrated the so-called ‘yin-yang’ sign (figure …