Fig. 8
From: Peroneal nerve: Normal anatomy and pathologic findings on routine MRI of the knee
Chronic muscle denervation. Axial (a) and sagittal (b) T1-WIs show fatty replacement and atrophy in the tibialis anterior muscle (arrowhead), extensor digitorum longus muscle (thin arrow) and peroneus longus muscle (thick arrow) of the left lower leg. There is also prominent fatty replacement and atrophy in the lateral head of the gastrocnemius muscle (asterisk). Previously this patient underwent a resection of a schwannoma at a more proximal level in the sciatic nerve