Acute Complete Foot Drop Caused by Intraneural Ganglion Cyst without a Prior Traumatic Event

Figure 2

T2-weighted MR axial (a) and coronal (b) images of the knee at the level of the tibiofibular joint. White arrows point to the ganglion cyst extending from the STF joint, and the black arrow points to the ascending oedematous CPN. T2-weighted axial image at the level of the fibular neck (c). A horizontal, linear area of increased T2 signal along the course of the nerve represents the extension of the ING along the transverse limb of the peroneal nerve articular branch (white arrow). T2-weighted axial image above the level of the fibular neck (d) showing an intraneural ganglion cyst (white arrow) in which the tibial and peroneal divisions are separately contained (arrowheads) T: tibia; F: fibula.

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