Fig. 16
From: Pseudotumoural soft tissue lesions of the hand and wrist: a pictorial review
Hypothenar hammer syndrome. a Sagittal SE T1-WI shows a hypointense lesion superficial to the flexor tendons (arrowhead) and immediately distal to the hamulus of the hamate (asterisk). b Axial FS SE T1-WI after intravenous administration of gadolinium contrast medium shows focal aneurysmal dilatation of the ulnar artery with central thrombosis (arrow). Note only faint peripheral enhancement. c Doppler ultrasound shows intraluminal thrombosis of the aneurysm of the ulnar artery. d MR angiography shows multiple stenoses at the distal ulnar artery with aneurysmal dilatation with internal clot formation (arrow)