Peroneal nerve : normal anatomy and pathologic findings on routine MRI of the knee
Faculty of Medicine and Health Sciences
Insights into imaging / European Society of Radiology. - Berlin, 2010, currens
, p. 1-13
University of Antwerp
Background Peroneal nerve lesions are not common and are often exclusively assessed clinically and electromyographically. Methods On a routine MR examination without dedicated MR-neurography sequences the peroneal nerve can readily be assessed. Axial T1-weighted sequences are especially helpful as they allow a good differentiation between the nerve and the surrounding fat. Results The purpose of this article is to review the normal anatomy and pathologic conditions of the peroneal nerve around the knee. Conclusion In the first part the variable anatomy of the peroneal nerve around the knee will be emphasized, followed by a discussion of the clinical findings of peroneal neuropathy and general MR signs of denervation. Six anatomical features may predispose to peroneal neuropathy: paucity of epineural tissue, biceps femoris tunnel, bifurcation level, superficial course around the fibula, fibular tunnel and finally the additional nerve branches. In the second part we discuss the different pathologic conditions: accidental and surgical trauma, and intraneural and extraneural compressive lesions.