title: Aneurysmal bone cyst in a six-month-old dog.
abstract: A 6-month-old female Yorkshire Terrier was examined because of acute left forelimb lameness secondary to a Salter-Harris type IV fracture of the lateral condyle of the humerus. Radiography revealed an eccentric, osteolytic lesion in the distal humeral metaphysis associated with a pathologic fracture. The limb was amputated, and the dog recovered. Microscopic examination revealed an extensive zone of hemorrhage and dilated coalescent spaces, which were filled with blood. Hemosiderin-laden macrophages and multinucleated giant cells were observed throughout the stroma. On the basis of clinical, radiographic, and histologic examinations, a diagnosis of aneurysmal bone cyst was made. Aneurysmal bone cysts generally have been detected in 11- to 13-year-old, medium- to large-sized dogs. They can develop secondary to malignant processes.
authors: Department of Small Animal Clinical Sciences, Michigan State University, East Lansing 48824-1314.
authors: R T
authors: RT
authors: Pernell
authors: R W
authors: RW
authors: Dunstan
authors: C E
authors: CE
authors: DeCamp
mesh_terms: D000818:Animals; D001845:Bone Cysts / Q000175:diagnosis / Q000601:surgery / Q000662:veterinary*; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D004285:Dogs; D005260:Female; D005598:Fractures, Spontaneous / Q000000981:diagnostic imaging / Q000209:etiology / Q000662:veterinary*; D006810:Humeral Fractures / Q000000981:diagnostic imaging / Q000209:etiology / Q000662:veterinary*; D007794:Lameness, Animal / Q000209:etiology*; D011859:Radiography