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Primary bone tumors arise directly from bone tissue, including its cellular components—osteoid (bone matrix), chondroid (cartilage), fibrous, or hematopoietic elements.

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https://www.youtube.com/watch?v=MgWRqBtXzI0

https://www.youtube.com/watch?v=wezFzUX-UWY

https://youtu.be/YeW48XoXqKo?si=rk54JnS5npU0GXmt

Classification

I. By Biological Behavior

Type Examples
Benign Osteoid osteoma, osteochondroma, enchondroma, fibrous dysplasia
Intermediate (locally aggressive) Giant cell tumor, chondromyxoid fibroma
Malignant Osteosarcoma, Ewing sarcoma, chondrosarcoma, malignant fibrous histiocytoma

Radiological classification based on aggressiveness:

Feature Non-aggressive Aggressive
Pattern of Destruction Marginated, geographic Moth-eaten, permeative
Zone of Transition Narrow Wide
Margins Sclerotic, well-defined Ill-defined
Periosteal Reaction Solid, single layer Lamellated, sunburst, Codman triangle
Cortical Destruction Absent/minimal Present
Soft Tissue Mass Usually absent Often present

![Radiographs (top) and histologic images (bottom) demonstrate different patterns of bone alteration and margins according to the Lodwick-Madewell grading system

Matcuk, G., Waldman, L., Fields, B.K. et al. Conventional radiography for the assessment of focal bone lesions of the appendicular skeleton: fundamental concepts in the modern imaging era. Skeletal Radiol 54, 1391–1406 (2025). https://doi.org/10.1007/s00256-024-04854-6](attachment:54dfbc97-f8b4-4b16-a3c8-88deb158b5f2:256_2024_4854_Fig6_HTML.webp)

Radiographs (top) and histologic images (bottom) demonstrate different patterns of bone alteration and margins according to the Lodwick-Madewell grading system

Matcuk, G., Waldman, L., Fields, B.K. et al. Conventional radiography for the assessment of focal bone lesions of the appendicular skeleton: fundamental concepts in the modern imaging era. Skeletal Radiol 54, 1391–1406 (2025). https://doi.org/10.1007/s00256-024-04854-6

II. By Tissue of Origin

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5th WHO classification

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Tissue Appearance Benign Tumors Malignant Tumors
Osteogenic Cloud-like, dense, ill-defined Osteoid osteoma, osteoblastoma Osteosarcoma
Chondrogenic Rings and arcs calcification Osteochondroma, enchondroma, chondroblastoma Chondrosarcoma
Fibrogenic Ground-glass opacity Fibrous dysplasia Fibrosarcoma, malignant fibrous histiocytoma (UPS)
Vascular Hemangioma Angiosarcoma
Hematopoietic Purely lytic — Ewing sarcoma, lymphoma, multiple myeloma
Giant cell-rich Purely lytic Giant cell tumor (GCT) Malignant GCT
Notochordal — Chordoma

![Typical bone tumors as they relate to events of normal growth and development.

Ragsdale, Bruce D., and Larisa M. Lehmer. "A knowledge of bone at the cellular (histological) level is essential to paleopathology." A companion to paleopathology (2012): 227-249.](attachment:e25ce5f7-c991-4a98-93ba-fdefdf1c1c42:1-s2.0-S1879981716300420-gr2.jpg)

Typical bone tumors as they relate to events of normal growth and development.

Ragsdale, Bruce D., and Larisa M. Lehmer. "A knowledge of bone at the cellular (histological) level is essential to paleopathology." A companion to paleopathology (2012): 227-249.

III. Epidemiology