A 34-year-old man presented with 1 year's duration of right-sided finger extension weakness, with mild sensory symptoms over the dorsum of the hand on exercising the right hand. There was a history of pain over the lateral aspect of the right elbow on playing tennis. On clinical examination, there was weakness of the finger extensors, with mild involvement of the wrist extensors. Muscle power testing of the brachioradialis and triceps were within normal limits. There were no associated sensory deficits, and tendon reflexes were normal. The possibility of right posterior interosseous nerve palsy was considered.
High-resolution ultrasonographic images of the posterior interosseous nerve at the radial tunnel, showing a normal-sized nerve on the left (A, arrow) and the enlarged nerve on the right (B, arrow). PIN indicates posterior interosseous nerve.
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Diagnostic Utility of Ultrasound in Posterior Interosseous Nerve Syndrome
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