Learning objectives
Bone sarcomas comprise a group of several different cancerous tumors of the bone.
The most common bone sarcomas diagnosed in children are osteosarcoma and Ewing's sarcoma.
Our purpose,
through this paper review,
is to expose the unusual locations of bone sarcoma in children and clarify the role of imaging in the positive diagnosis and staging.
Background
Unusual locations of bone sarcoma are exceptional and radiographic appearance has no semiologic particularity.
So they must be suspected especially in children when radiological exam reveal an aggressive osteolytic lesion.
MRI remains the most useful examination for better tumor characterization and the evaluation of locoregional extension.
The final diagnosis of bone sarcoma requires histopathological verification.
Findings and procedure details
Sarcomas are the most common bone tumors in pediatric setting.
The sarcomas of long bones are the most common and are dominated in children by osteosarcoma and Ewing's sarcoma.
1/ Osteosarcoma:
Osteosarcoma is the most common malignant bone tumor in children.
Its usual seat is the metaphysis of long bones.
Its frequency is estimated at about 2%.
All types of osteosarcoma can be met at the clavicle and scapula:
ü Chondroblastic. born in the body of the scapula.
ü Osteoblastic.
ü Telangiectasic: usually born at...
Conclusion
Unusual locations of bone sarcoma are exceptional and radiographic appearance has no semiologic particularity.
So they must be suspected especially in children when radiological exam reveal an aggressive osteolytic lesion.
MRI remains the most useful examination for better tumor characterization and the evaluation of locoregional extension.
The final diagnosis of bone sarcoma requires histopathological verification.
References
1- Cho WH,
Song WS,
Jeon DG,
Kong CB,
Kim MS,
Lee JA,
Yoo JY,
Kim JD,
Lee SY.
Differential presentations,
clinical courses,
and survivals of osteosarcomas of the proximal humerus over other extremity locations.
Ann Surg Oncol.
2010 Mar;17(3):702-8
2- Geens L,
Robays JV,
Geert V,
der Speeten KV.
An Unusual Location of Extraosseous Ewing's Sarcoma.
Case Rep Oncol.
2013 May 30;6(2):293-302
3- Desai K,
Goel A,
Nadkarni TD Primary petrous bone Ewing's sarcoma.
Br J Neurosurg.
2000 Apr;14(2):143-5.