osteosarcoma (redirected from parosteal osteosarcoma)

osteosarcoma /os·teo·sar·co·ma/ (os″te-o-sahr-ko´mah) a malignant primary neoplasm of bone composed of a malignant connective tissue stroma with evidence of malignant osteoid, bone, or cartilage formation; it is subclassified as osteoblastic, chondroblastic, or fibroblastic.osteosarco´matous

---

parosteal osteosarcoma  a variant consisting of a slowly growing tumor resembling cancellous bone but arising from the cortex of the bone and slowly growing outward to surround the bone.

periosteal osteosarcoma  a variant of osteochondroma consisting of a soft, lobulated tumor arising from the periosteum of a long bone and growing outward.

small-cell osteosarcoma  a variant of osteosarcoma resembling Ewing's sarcoma, with areas of osteoid and sometimes chondroid formation.

---

os·te·o·sar·co·ma (st--sär-km)

n.

A malignant bone tumor. Also called osteogenic sarcoma.

---

osteosarcoma

[os′tē·ō′särkō′mə]

Etymology: Gk, osteon + sarx, flesh, oma

a malignant tumor of the bone, composed of anaplastic cells derived from mesenchyme. It is the most common type of primary malignant bone tumor, accounting for 35% of such malignancies. It occurs most often in the distal femur. Metastasis to the lung occurs more often in males than in females. It occurs most frequently between the second and fourth decade of life. Also called osteogenic sarcoma.

---

osteosarcoma (os´tēōsärkō´m),

n a malignant neoplasm of the bone-forming tissues.

---

osteosarcoma

bone-producing malignant tumor; common in dogs and cats, but rare in other species. Dogs of large breeds are more frequently affected and the most common sites are distal humerus or femur and proximal radius or tibia. Lameness, swelling and rapid metastasis to the lungs are usual features.