Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

516 Small Animal Radiolo g y and Ultrasono graphy
Fig. 4-52 A 6-year-old male Golden
Retriever with an acute onset of left
foreleg lameness. The leg was painful
when it was manipulated. There is a
pathologic fracture involving the
proximal humerus. The bone density
is decreased, with a pattern of
radiolucency extending into the
middiaphysis. There is no evidence
of bony proliferation or soft-tissue
calcification. The scapula is not
involved despite the extensive
humeral destruction. Diagnosis:
Hemangiosarcoma. The radiographic
changes indicate a pathologic fracture
secondary to a primary bone
tumor. The final diagnosis was based
on the histology of the lesion.
Fig. 4-53 A 12-year-old male Welsh
Corgi with anorexia, depression, and
weight loss of 1 month duration.
Radiographs of the long bones were
obtained after abnormalities were
noted on the thoracic and abdominal
radiographs. There are multiple
semicircular lytic lesions within the
femur and humerus that do not have
sclerotic margins. There is no evidence
of periosteal proliferation.
Diagnosis: Multiple myeloma.