5. Additional history
• No known underlying disease
• No cancer in family history
• Smoking 5 packed-year
• Social alcohol drinking
• No hematologic disease in family history
6. Physical examination
• HEENT: not pale,no jaundice
• Lung: clear equal breath sound both lung
• CVS: normal s1s2, no murmur, full regular pulse
• Abdomen: soft, not tender, no guarding, no mass
palpable
• Ext: A mass size 8*8 cm at lateral side of proximal
tibia, smooth surface, no pulsatile, no pain, firm
consistency
12. Bone scan
• Findings:
1.Abnormal increase uptake at proximal of left tibia.
2.Hot lesion at right forearm is retention of radioactivity in injection
plug.
3.Normal physiologic uptake at both kidneys.
Impression: Single lesion at proximal of left tibia.
13.
14. FINDINGS: There is cortical-based bone mass with intramedullary extension and cortical
destruction in proximal tibia. - Size: 13.6x5.6x7.7 cm (LxAPxW). - Anatomic Location:
Proximal meta-epiphysis in lateral aspect of tibia. Characteristics: - Signal intensity: There
is isointense on T1W, hyperintense with heterogeneous dark signal on T2W, restricted
diffusion, and heterogeneous enhancement. - Uniformity: Heterogeneous. - Fluid-Fluid
Levels: None. - Transition Zone: Wide-edema. Extent - Articular involvement: None. -
Neurovascular Involvement: Mass compresses anterior tibial vessels. - Osseous
Involvement: Mass forming abuts the proximal fibula. - Tendon Involvement: Mass
forming abuts the patellar tendon. - Muscle Involvement: Mass invades the tibialis
anterior, extensor digitorum longus, and tibialis posterior muscles.
IMPRESSION: 1.Malignant bone tumor in lateral aspect of proximal tibia (13.6x5.6x7.7
cm). Differential possibilities include juxta-cortical chondrosarcoma and parosteal
osteosarcoma.
16. How to approach bone tumor films ?
• Enneking’s Queastions
•1 Where is the lesion?
•2 What is the lesion doing to the bones?
•3 What is the bone doing?
•4 What is the lesion?
18. What is the lesion doing to the bones?
• Osteolytic VS Osteoblastic
• Geographic boarder
• Moth eaten boarder
• Permiative boarder
19.
20. What is the bone doing?
• Solid periosteal reaction
• Codman’s triangle
• Onion skin
• Sunray or sun burst appearance
21.
22. What is the lesion?
• Calcification
• Osteoid
• Ground grass appearance
• Soap and bubble appearance
23. Osteosacroma:
• primitive mesenchymal bone-forming cells
• the distal femur, the proximal tibia, and the proximal humerus
• The exact cause of osteosarcoma is unknown.
• Risk factors
• 1. Rapid bone growth
• 2. Genetic predisposition
• 3. Radiation