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Table 1 Types of OS

From: Osteosarcoma: a review of current and future therapeutic approaches

1. Central OS 2. Multifocal
 a. Conventional 3. Gnathic
  i. Osteoblastic 4. Surface OS
  ii. Chondroblastic   a. Periosteal
  iii. Fibroblastic   b. Parosteal
 b. Epithelioid   c. High-grade surface
 c. Giant cell-rich   d. Intracortical
 d. Osteoblastoma-like 5. Secondary OS
 e. Small cell  
 f. Telangiectatic  
 g. Low-grade central