a. Conventional high-grade central osteosarcoma
b. Telangiectatic osteosarcoma
c. Intraosseous well-differentiated (low-grade) osteosarcoma
d. Small cell osteosarcoma
SURFACE (PERIPHERAL)
a. Parosteal (juxtacortical) well-differentiated (low-grade) osteosarcoma
b. Periosteal osteosarcoma - low- to intermediate-grade osteosarcoma
c. High-grade surface osteosarcoma
Table 1: Osteosarcoma subtypes within central and surface tumors (The World
Health Organization’s histologic classification of osteosarcoma).
