Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Chapter Four The Appendicular Skeleton 487
Fig. 4-13 A 9-month-old male Doberman Pinscher with an acute onset
of left rear leg lameness. There was no evidence of trauma. There is a large
radiolucent lesion in the middle and distal portions of the left femur. The
lesion’s margins are smooth, the cortex is thin, and there is no evidence of
periosteal proliferation. There is a comminuted fracture through this area
with cranial displacement of the distal fragment. Diagnosis: Pathologic
fracture. This fracture has occurred through a primary bone cyst.
Fig. 4-14 A 9-year-old neutered male Boxer brought in for evaluation
of chronic lameness of the left hind limb that had worsened acutely.
Examination of the anteroposterior view reveals a poorly delimited,
diffuse lytic lesion of the tibia that is focused on the midshaft. There is
a pathologic fracture (arrows) through the tibia. Diagnosis: Pathologic
fracture through the tibia secondary to primary hemangiosarcoma.