Primary ischial osteosarcoma occupying the pelvic cavity in a Japanese Black cow.
A 10-year-old Japanese Black cow presented with a swelling of the right femur, and a hard, large mass occupied the pelvic cavity. The mass strongly adhered to the visceral surface of the ischium and had posteriorly invaded among the right femoral muscles. Histologically, the mass was composed of neoplastic osteoblasts and exhibited osteoid and immature trabecular bone production. In the region where the mass adhered to the ischium, neoplastic cells were continuously proliferating into the medullary cavity. Tumor emboli were observed in the small vessels of the femoral muscles and lungs. Based on these findings, the mass was diagnosed as an osteosarcoma and considered to have arisen from the ischium.
Department of Veterinary Pathology, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8501, Japan.
Eiji
E
Nagamine
Kazuya
K
Matsuda
Chiaki
C
Ishii
Masateru
M
Koiwa
Hiroyuki
H
Taniyama
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D005260:Female; D007512:Ischium / Q000473:pathology*; D007564:Japan; D012516:Osteosarcoma / Q000473:pathology / Q000662:veterinary*; D052097:Quadriceps Muscle / Q000473:pathology