131 Review of the role of bone-SPECT/CT in tarsal coalitions Figure 7. The cross-sectional bone-SPECT/CT of the same patient as Figure 5 more precisely depicts the partially ossified coalition, with increased bone-turnover at the calcaneonavicular articulation as well as increased bone-turnover on the dorsal side of the left ankle joint as an additional finding, caused by an os trigonum (blue arrow). Completely ossified CNC Complete osseous CNC may be visualized using plain radiographs, typically with a calcaneonavicular bone bar and flat foot deformity (pes planovalgus) on lateral projection (Figure 9, red circle). MR imaging will often show no bone edema at the site of complete osseous CNC, but may reveal bone marrow edema in adjacent structures (Figure 9, green arrow on T2 fat sat, image on the right). 5