Fig. 10
From: An overview of neuromuscular ultrasound of important small nerves
Example of pathologies of the deep radial nerve. A Short-axis view of the posterior interosseus nerve showing nerve enlargement as the nerve passes between the two heads of the supinator denoting local entrapment with marked hyperechogenicity and atrophy of the supinator and the overlying ED. B Short-axis view of the PIN showing focal nerve enlargement at the Arcade of Froshe denoting local entrapment just proximal to the supinator tunnel