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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.
