Osteosarcoma x ray: Difference between revisions
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Image:Osteosarcoma-002.jpg|Plain film: Osteosarcoma | Image:Osteosarcoma-002.jpg|Plain film: Osteosarcoma | ||
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==Extra skeletal osteosarcoma== | |||
On X-ray, extra skeletal osteosarcoma appears as soft tissue density with variable amount of [[calcification]] which represents [[osteoid]] matrix formation, and is seen in approximately 50% of cases. | |||
==Parosteal osteosarcoma== | |||
*Large lobulated exophytic, 'cauliflower-like' mass with central dense ossification adjacent to the bone. | |||
*'''String sign''': Thin radiolucent line separating the tumor from cortex, observed in 30% of cases. | |||
*Tumor stalk: Grows within tumor in late stages and obliterates the radiolucent cleavage plane. | |||
*+/- soft tissue mass. | |||
*Cortical thickening without aggressive periosteal reaction is often seen. | |||
*Tumor extension into medullary cavity is frequently observed. | |||
==References== | ==References== | ||
Revision as of 16:05, 28 September 2015
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Osteosarcoma Microchapters |
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Diagnosis |
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Treatment |
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Case Studies |
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Osteosarcoma x ray On the Web |
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American Roentgen Ray Society Images of Osteosarcoma x ray |
Overview
On x-ray, osteosarcoma is characterized by medullary and cortical bone destruction, periosteal reaction, tumor matrix calcification and soft tissue mass.[1]
X Ray
Conventional radiography continues to play an important role in diagnosis of osteosarcoma. Typical appearances of conventional high grade osteosarcoma include:[1]
- Medullary and cortical bone destruction.
- Wide zone of transition, permeative or moth-eaten appearance.
- Aggressive periosteal reaction characterized by:
- Sunburst appearance
- Codman triangle
- Lamellated (onion skin) reaction: less frequently seen
- Soft-tissue mass.
- Tumor matrix ossification/calcification.
- Variable: reflects a combination of the amount of tumor bone production, calcified matrix, and osteoid.
- Ill-defined fluffy or cloud-like cf. to the rings and arcs of chondroid lesions.
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Plain film: Osteosarcoma -
Plain film: Osteosarcoma
Extra skeletal osteosarcoma
On X-ray, extra skeletal osteosarcoma appears as soft tissue density with variable amount of calcification which represents osteoid matrix formation, and is seen in approximately 50% of cases.
Parosteal osteosarcoma
- Large lobulated exophytic, 'cauliflower-like' mass with central dense ossification adjacent to the bone.
- String sign: Thin radiolucent line separating the tumor from cortex, observed in 30% of cases.
- Tumor stalk: Grows within tumor in late stages and obliterates the radiolucent cleavage plane.
- +/- soft tissue mass.
- Cortical thickening without aggressive periosteal reaction is often seen.
- Tumor extension into medullary cavity is frequently observed.
References
- ↑ 1.0 1.1 Osteosarcoma. Dr Amir Rezaee ◉ and Dr Frank Gaillard ◉ et al. Radiopaedia.org 2015. http://radiopaedia.org/articles/osteosarcoma