Ultrasound of the Month Case #108

Clinical History 46 year old male with weakness with finger extension

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Diagnosis: Compression of the Deep Branch of the Radial Nerve/Posterior Interosseous Nerve.

Discussion The deep branch of the radial nerve is one of the two terminal branches of the radial nerve, the other being the superficial branch.

Compression of the deep branch can occur at several different points and can present as either radial tunnel syndrome or posterior interosseous nerve (PIN) syndrome.

Radial tunnel syndrome presents as pain without motor symptoms, while PIN syndrome presents as weakness.

Ultrasound can be useful for evaluating patients presenting with either radial tunnel syndrome or PIN syndrome.

Soft tissue masses or anatomical variants causing nerve compression may be visible on ultrasound, although fibrous bands may not be appreciable.

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