Fig. l.A frontal plane view roentgenogram shows an expanding, lyric lesion with a minima1 intralesional density and a sclerotic rim in the proximal portion of the left third metatarsal Fig. 2. A lateral view roentgenogram shows a bulging, thin, and eroded cortex with minimal intralesional density and periosteal reaction is the left third metatarsal
Clinical informationA 4-year-old, 70 kg, male Great Dane dog was studied for lameness in a left rear limb and a firm, painful swelling of the left metatarsal region of several weeks' duration. The lameness and swelling were partially responsive to antibiotic treatment. On physical examination, a palpable mass approximately 1.5 x 3.5 cm was noted with tenderness to palpation but no associated redness.Radiographs of the left metatarsus revealed an expanding, lyric lesion in the third metatarsal bone. Bulging of the anterior surface corresponded to the palpable mass. The cortex was thin and eroded in areas with minimal periosteal reaction and sclerosis in the proximal region of the third metatarsal bone (Fig. 1, 2).A surgical biopsy of the lesion was performed,