Coronal FS T2-weighted MRI of the posterior knee in a teenag | Figure 1

CincyKidsRad

Cincinnati Children's Radiology

Coronal FS T2-weighted MRI of the posterior knee in a teenager with neurofibromatosis type I shows multiple elongated fluid-signal intensity lobules along the expected courses of the sciatic, tibial, & common peroneal nerves. Central hypointense foci (which create a “target appearance” in cross-section) are seen in some of the lesions (white arrows), typical of plexiform neurofibromas. #MSKMonday

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Cor T2W FS MR image of the left knee in a teenager who suffered a knee dislocation shows injury of numerous supporting structures. There is a high grade tear of the proximal lateral/fibular collateral ligament (blue), and the popliteus tendon has been completely avulsed (orange). The femoromeniscal component of the deep MCL (yellow) is also torn. Only a few ACL fibers (pink) can be identified. The PCL was also torn (not shown).

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