Figure 11. A 73-year-old man underwent brachial artery catheterization for cerebral angiography. The patient complained of a painful sensation over the elbow and right hand after the procedure. Photograph (middle) shows the location of injury. US scans of the elbow show an echo-free hematoma (arrowheads) in close contact with the median nerve (arrows) in the sagittal (Sag) view. In the transverse (Tr) view, the hematoma was found within the epineurium of the median nerve (arrows). Color Doppler image (lower left) shows the brachial artery beneath the hematoma.