There are two patterns of increased radioisotope uptake in the navicular bone. 1)
Focal central uptake generally seen in older show horses with equivocal or classic
radiographic changes. The focal nature of the uptake is more important than the actual
intensity. 2) Mild to moderate uptake of the entire width of the navicular bone seen
mostly in young race horses. Radiographs are usually negative.
increased radioisotope uptake of the navicular bone is rare. The navicular bone is
normally not seen.