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1.Lateral femur. 2.Medial Femur 3.Medial tibia 4. Lateral Humerus.
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osteochondroma distal femur medial condyle X-ray knee bone tumor most common location
Answer: Medial Femur (Option 2)
The correct answer is 2. Medial Femur.
What the X-ray shows
This is an AP (anteroposterior) radiograph of the right knee. There is a large, lobulated, densely calcified/ossified exostosis (bony outgrowth) projecting from the medial aspect of the distal femur, just above the medial femoral condyle. This is a classic appearance of an osteochondroma (also called an osteocartilaginous exostosis).
Why it is the medial femur - key radiological clues
- The mass is arising from the femur (upper bone of the knee joint), not the tibia (lower bone)
- It projects from the medial side (left side of the femur on this AP view, which corresponds to the patient's medial aspect)
- The lesion has the classic features: bony stalk continuous with the cortex and medullary cavity of the femur, with an irregular calcified cartilage cap
Osteochondroma - key facts
| Feature | Detail |
|---|---|
| Most common benign bone tumor | 20-50% of benign bone tumors |
| Favorite site | Distal femur (24.5% of all osteochondromas) |
| Typical location | Metaphyseal region, pointing away from the joint |
| X-ray | Pedunculated or sessile bony outgrowth, cortex blends with host bone |
| Malignant transformation | ~1% (suspect if cartilage cap >1.5 cm in adults or growing after skeletal maturity) |
The distal femur - particularly the medial condyle/metaphysis - is by far the most common single location for osteochondromas, as confirmed by both Robbins Pathology (which illustrates this exact lesion arising from the distal femur) and Grainger & Allison's Diagnostic Radiology, and multiple clinical sources.
The answer is 2 - Medial Femur.
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