Classification, imaging, biopsy and staging of osteosarcoma

Area of Science:

• Orthopedic Oncology
• Skeletal Malignancies
• Bone Cancer Research

Background:

• Osteosarcoma is the most frequent primary bone cancer, excluding marrow tumors.
• It predominantly affects individuals under 20, typically in the long bones near the knee.
• Classified as primary or secondary, it arises from specific bone conditions.

Purpose of the Study:

• To outline the diagnostic modalities for osteosarcoma.
• To describe the role of various imaging techniques in staging and treatment planning.
• To highlight the importance of biopsy and staging systems in managing osteosarcoma.

Main Methods:

• Conventional radiography for initial diagnosis, identifying characteristic features like sunburst appearance and Codman's triangle.
• Advanced imaging including CT scans for pulmonary metastasis, MRI for local tumor extent and neurovascular involvement.
• Bone scintigraphy (Tc99) for osseous metastases and PET scans for metastatic workup and recurrence detection.

Main Results:

• Plain radiographs are crucial for initial diagnosis, revealing specific destructive patterns and new bone formation.
• CT and MRI provide detailed information on tumor spread and relationship to surrounding structures.
• Biopsy is essential for definitive diagnosis and tumor grading, with staging systems (Enneking, AJCC) crucial for treatment stratification.

Conclusions:

• A combination of advanced imaging techniques and biopsy is vital for accurate osteosarcoma diagnosis, staging, and treatment planning.
• Radiographic features and imaging findings guide the selection of appropriate diagnostic and therapeutic strategies.
• Biochemical markers and established staging systems aid in prognosis and monitoring treatment response.