PMC5576163_01
Lateral plain radiograph of left leg: sessile protrusion from the posterior surface of the proximal tibia.
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A radiograph showed a pedunculated exostosis on the proximal tibia (Fig. 1).
Duplex scan: hypoechogenic mass in the popliteal fossa adjacent to the popliteal artery with characteristic yinyan image of pseudoaneurysm.
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Doppler ultrasonography reported a hematoma in the popliteal fossa (Fig. 2).
CT scan axial and sagittal view: 8 cm mass in contact with tibial exostosis.
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CT scan revealed a proximal tibial exostosis, and an 8 cm diameter largely thrombosed false aneurysm of the distal popliteal artery, in close relation to a proximal tibial exostosis (Fig. 3).
MRI axial and sagittal view: the exostosis has continuity of tibial bone cortex with an overlying cartilage cap, in contact with the pseudoaneurysm.
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MRI showed a unilateral lesion in the left tibia and no signs of malignancy of the soft tissue (Fig. 4).
Intra-operative image showing exostosis of the tibial bone before its resection.
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The damaged vessel was repaired by longitudinal arteriotomy and closure with an external saphenous vein patch (Fig. 5).