127 Review of the role of bone-SPECT/CT in tarsal coalitions Figure 4. Same 16-year-old female patient as in Figure 1. (a) Image on the left with planar blood pool (early) phase bone scintigraphy of the left ankle and foot with increased blood pool in the left tarsus and image on the right with planar late (mineralization) phase with increased bone turnover in the left tarsus. (b) Images on the left bone-SPECT/CT of the left ankle (upper image sagittal, lower image transverse) with clear localization of increased bone turnover in a non-osseous calcaneonavicular. MRI in the same patient MRI, demonstrating a hypointense band at the non-osseous calcaneonavicular and adjacent bone edema on sagittal T1-weighted sequences (middle images). On T2-weighted sequences with fat suppression (image on the right), a hypointense band at the site of the non-osseous calcaneonavicular with accompanied adjacent bonemarrow edema. The hypointense signal on both sequences is consistent with a fibrous calcaneonavicular. CT, computed tomography. 5