PMC4899874_01
25-year-old male with congenital distal tibiofibular synostosis. Anteroposterior and lateral radiograph of right ankle including the lower tibia and fibula show bony bridge (open arrows) causing complete synostosis of distal tibiofibular joint.
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Initially, both anteroposterior and lateral x-rays of the ankle joint (including the lower tibia and fibula) showed a bony bridge causing complete synostosis of the distal tibial and fibular metadiaphysis (Fig. 1).
25-year-old male with congenital distal tibiofibular synostosis. A: CT axial sections through the lower tibia and fibula demonstrate the complete bony fusion (open arrow) with central areas of fat attenuation (black arrow) as compared to normal contralateral side. B: 3D CT shows the bony bridge along the interosseous membrane leading to complete fusion (black arrow).
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CT demonstrated the complete fusion of the distal tibia and fibula, with fat attenuation areas at the site of synostosis (Fig. 2A). Three-dimensional CT showed that the bony bridge extended along the interosseous membrane, leading to complete fusion (Fig. 2B).
25-year-old male with congenital distal tibiofibular synostosis. A, T1-weighted, and B, T2-weighted fat-suppressed serial axial MR images depict the bony fusion (white arrows) with fatty changes at the site of fusion (black arrow). There is no abnormal marrow signal intensity or underlying lesion.
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MRI further confirmed the distal tibiofibular synostosis with fatty changes (Figs. 3A and B).