Today’s case is a 4-month-old male Labrador Retriever with one-month history of multiple limb lameness, fever, and anorexia. This one is a classic! Post your comments below.
Findings
LEFT RADIUS/ULNA: Marked, irregularly marginated periosteal proliferation is present circumferentially involving the distal metaphyses of the radius and ulna. Faintly visible, irregular radiolucency is present in the distal ulnar metaphysis, just proximal to the physis. Smoothly marginated mineral opacities are present at the medial and lateral aspect of the proximal humeral metaphysis; a small gap is present between these mineral opacities and the margin of the humeral cortices.
RIGHT RADIUS/ULNA: Changes in the right antebrachium to those observed in the left. Additionally, there is moderate, irregular periosteal proliferation at the cranial and caudal aspect of the proximal humeral metaphysis with large, distinct mineral opacities at the medial and lateral aspect of the proximal aspect of the proximal humeral metaphysis, similar to the left humerus.
LEFT TIBIA/FIBULA: Moderate to marked, irregularly margined periosteal proliferation is present involving the metaphyses of the femur and tibia, similar to the lesions observed in the thoracic limbs. The first affected metaphyses are those of the proximal and distal tibia. Moderate soft tissue swelling is present around the proximal and distal aspects of the crus.
RIGHT TIBIA/FIBULA: Changes in the right are similar to those observed in the left.
Diagnosis
Multifocal, bilaterally symmetrical periosteal proliferation of the metaphyses of the proximal humeri, radius and ulna, femurs and tibias; the primary differential diagnosis— developmental orthopedic disease such as hypertrophic osteodystrophy.
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