Neoplastic conditions of bone Flashcards
1
Q
fibrous tumors of bone
A
- fibrosarcoma
- medullary cavity and periosteum
- less likely to metastasize than osteosarcoma
2
Q
cartilage-forming tumors
A
- rare except in sheep
- difficult to diagnose and classify
- chondroma: benign
- chondrosarcoma: malignant, arise from cartilage, occur in pelvis/nasal cavity/sternum/ribs
3
Q
osteoma
A
- benign tumor of bone
- uncommon
- usually involve bones of head
4
Q
osteosarcoma
A
- malignant tumor in which osteoid or bone is produced
- most common skeletal neoplasm in dogs and cats, rare in other species
- often metastasizes to lungs
- painful swellings of bones
- forelegs > hindlegs
- proximal humerus/distal radius > distal tibia/femur
- mature males of large breeds
- sudden increase risk after 5 years, decreases after 9 years of age
5
Q
associations with osteosarcoma
A
- bone infarction
- previous fractures
- metallic fixation devices
- viral origin in mice
6
Q
what do osteosarcomas produce
A
osteoid
7
Q
miscellaneous tumors of bone (3)
A
- bovine lymphoma of juvenile type
- myeloma (plasmacytoma) in dogs
- primary hemangiosarcoma of bone in dogs
8
Q
tumors metastatic to bone
A
- direct extension or hematogenous
- hematogenous metastases very rare in farm animals, relatively rare in pets
- most metastases are carcinomas
