Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

A
Fig. 4-95 A 5-month-old female Great Dane had been nonambulatory for 3 days at the time of
arrival. Swelling was present in the distal metaphyseal area of the radius and ulna and in the distal tibial
metaphyses bilaterally. Radiographs of these areas were obtained. Radiographs of the right carpus
(A) and follow-up radiographs obtained 2 months later (B) are illustrated. There is soft-tissue swelling
in the area proximal to the carpal joint. The metaphyseal regions of the distal radius and ulna are
widened and the periosteal margins are irregular. A radiolucent line is present in the distal radial and
ulnar metaphyses immediately proximal to the physeal growth plate (arrows). There is a zone of sclerosis
proximal to this radiolucent line. The distal ulnar metaphysis has lost its normal conical shape.
In the radiographs obtained 2 months after the initial visit, the distal radial and ulnar metaphyses
remained widened. The ossification pattern within the medullary canal is irregular. The distal ulnar
metaphysis has regained its conical shape. Periosteal proliferation surrounds the distal radial and ulnar
metaphyses. The distal radial and ulnar physes appear normal; however, a mild bowing and valgus
deformity had resulted from the altered growth of the limb. Diagnosis: Hypertrophic osteodystrophy.
B
Fig. 4-96 A 5-month-old female Weimaraner that had been
lame, reluctant to walk, and had an intermittent fever for 5 weeks.
Radiographs of both forelimbs were obtained. The left forelimb
radiographs are illustrated. There are areas of increased density
within the proximal and distal radial and ulnar metaphyses. An
area of radiolucency is noted within the distal radial and ulnar
metaphyses (arrows). Periosteal proliferation is noted along the
medial surface of the distal radius and caudal aspect of the distal
ulna. Similar periosteal proliferation is present on the cranial surface
of the proximal radius and on the medial aspect of the distal
humeral metaphysis. Diagnosis: Hypertrophic osteodystrophy.
The radiolucent band has been referred to as a double epiphyseal
line. Similar lesions were present in the right forelimb.