Ulnar artery aneurysm
Presented with several days of right hypothenar pain and paraesthesia. No single traumatic event and specifically no penetrating injury. On examination, fingers were normal colour.
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There is fusiform dilatation of ulnar artery in the hypothenar region at the site of pain. Ulnar artery diameter is 3 mm proximal to dilatation. Focal arterial dilation measures about 11 x 8 mm with arterial wall around it. Ulnar artery shows branching just after this focal dilatation. There is no thrombosis.
The ulnar artery lies superficial in the palm where it is at risk of compression due to the hook of the hamate. Injury to tunica intima results in thrombosis. Injury to tunica media results in wall weakening and aneurysm development.