Cystic lesions of peripheral nerves: Are we missing the diagnosis of the intraneural ganglion cyst?

Figure 2 A shows a diagrammatic representation of the intraneural ganglion cyst associated with the proximal tibiofibular joint in the sagittal plane; B-E serial, sagittal, T2-weighted, fast spin echo images of the knee show the origin of the lobulated tubular cyst from the proximal tibiofibular joint represents the “tail sign” (black arrows). The further extension along the descending limb (yellow arrows) represents the “vertical limb sign” and ascending limb (red arrows) of the articular branch demonstrates the “transverse limb sign”; which continues to the CPN (blue arrows). The cyst also extends along the deep peroneal nerve (open arrows) in image E. T: Tibia; F: Fibula; CPN: Common peroneal nerve; Fe: Femur.