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This short communication describes a case of pathological fracture secondary to osteosarcoma in an Arabian camel (Camelus dromedarius). A seven-year-old intact female Arabian camel was presented to the North Carolina State University's College of Veterinary Medicine Veterinary Teaching Hospital for evaluation of a left forelimb lameness of three days' duration. The camel was found at pasture with an acute, non-weight-bearing lameness on the left forelimb, which was swollen in the radiohumeral region. Treatment with butorphanol (0•06 mg/kg orally every 24 hours), diazepam (0•02 mg/kg orally every 24 hours), and a single oral dose of 1•1 mg/kg flunixin meglumine had been administered by the referring veterinarian. The camel had calved eight months previously, and had given birth to one other calf before that, but had no other significant medical history. Upon arrival, the camel was quiet and dull, with a normal rectal temperature (37•7°C, reference range 36•4 to 42°C), tachycardia (88 bpm, reference range 40 to 50 bpm) and tachypnoea (28 breaths/minute, reference range 5 to 12 breaths/minute). Auscultation of the heart and lungs revealed no audible abnormalities. The faeces were soft, and adequate borborygmi were audible in all four abdominal quadrants. The body condition score was 4/9. Severe lameness (grade 4/5) was apparent in the left forelimb, with moderate swelling around the left elbow. Radiographs of the left radiohumeral joint revealed a cranially displaced oblique articular fracture involving the proximal ulna. The fracture line extended from the trochlear notch to the caudal surface of the ulna distal to the olecranon. Slight radiolucencies were noted in the bone at the cranial edge of the fracture (Figs 1, 2). Cranial displacement of the distal radius and ulna had resulted in subluxation of the radiohumeral joint. A complete blood count revealed mild anaemia (packed-cell volume 21 per cent, reference range 24 to 42 per cent) and a regenerative neutrophilia (white blood cell count 19•8 x 10 3 cells/µl [reference range 2•9 x 10 3 to 9•7 x 10 3 cells/µl]; absolute numbers of bands 0•2 x 10 3 cells/µl [the presence of any bands is considered abnormal]). A serum chemistry panel revealed mildly elevated levels of globulin (46 g/l, reference range 28 to 44 g/l) and gamma glutyltransferase (39•0 iu/l, reference range 0 to 20 iu/l),