PMC3728537_01
Left foot (a) CT scan: navicular bone indentation and subcortical lesion (arrow). (b) MRI: talonavicular joint effusion and irregularity of the proximal articular surface of the navicular bone (arrow). (c) Osseous scintigraphy: hyperfixation focus at the left navicular bone (arrow).
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An articular computerized tomography (CT) scan of the patient's left ankle disclosed a navicular bone indentation with subcortical lesion, but it could not differentiate whether it was the result of an osteochondritis dissecans or of an osteomyelitis (Figure 1(a)). A magnetic resonance imaging (MRI) of the same region revealed a talonavicular joint effusion and irregularity of the proximal articular surface of the navicular bone, with a small cortical depression, suggesting an osteochondritis dissecans (Figure 1(b)). Osseous scintigraphy brought out intense hyperfixation at the left navicular bone (Figure 1(c)).
Radiographs of the left foot at 4-month (a) and 2-year (b) follow-up consultations, showing a favorable radiologic evolution.
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Radiographs of the left foot corroborate the positive clinical outcome (Figure 2).