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Fig. 6A —Common peroneal nerve entrapment in 14-year-old boy with clinical and electromyography evidence of common peroneal neuropathy. Axial T1 images (TR/TE, 466/9) (A, B, and D) and T2 fat-saturated image (3,800/119) (C) of knee show hypertrophied muscle belly of short head of distal biceps femoris muscle (curved arrow, A and B) associated with tunnel formation (circle, A and B). Common peroneal nerve (black arrow, A-C) is lying inside this tunnel, between short head of biceps femoris and lateral head of gastrocnemius muscle (asterisk, A and B) and has increased signal on T2-weighted image. There is also denervation edema and minimal denervation atrophy (white arrow, C and D) of anterior compartment of leg.