CROSSTALK: COMBINING DIAGNOSTIC APPROACHES FOR CASE SUCCESS
Fig. 7. Transverse CT (A, B), fused 18F-NaF PET/CT (C, D), and 18F-NaF PET (E, F) images of the proximal metacarpus of a 4-year-old Quarter Horse. The top row shows the initial scan when lameness was localized to this area, and the bottom row is a recheck 4months later when lameness had resolved. There is irregularity of the palmar aspect of the third metacarpal bone at the site of attachment of the suspensory ligament with evidence of both resorption (long arrow) and enthesophyte formation (short arrows) on the initial CT images. This is associated with marked focal increased 18F-NaF uptake on the initial scan (arrowheads). On the recheck scan, the CT changes remain similar (arrows); however, the 18F-NaF uptake has resolved, confirming resolution of the active remodeling.
Fig. 8. Transverse 18F-FDG PET (A), fused PET/CT (B), noncontrast (C), and arterial contrast (D) CT, T1-w MRI (E), and T2-w MRI (F) images of the right fore foot of a 14-year-old Quarter Horse mare with lameness localized to this foot. Lateral is to the left. There are two focal areas of marked increased 18F-FDG uptake at the dorsal aspect of the DDFT, with the lateral area of uptake (long arrow) larger than the medial one (short arrow). These correspond to hypoattenuating areas on noncontrast CT with presence of arterial contrast enhancement and hyperintensity noticed both on T1-w and T2-w MRI. On all modalities, the changes are more severe at the dorsal aspect of the lateral lobe (long arrow) when compared with the medial lobe (short arrow). This demonstrates biaxial active supranavicular dorsal fibrillation of the DDFT.3