Bone tumours

Question 1

What is the most common benign tumour of bone?

Answer 1

Osteochondroma

Question 2

What is the characteristic feature of osteochondroma?

Answer 2

Exostoses

Question 3

What is the most common primary malignant tumour of bone?

Answer 3

Osteosarcoma.

Question 4

Where do osteosarcomas arise?

Answer 4

The metaphysis of long bones. Most commonly the distal femur or proximal tibia.

Question 5

What is the biggest cause of secondary osteosarcoma?

Answer 5

Malignant degeneration of Paget’s disease.

Question 6

At what age does Ewing sarcoma usually present?

Answer 6

10-15 years old

Question 7

Multiple endochondromas is referred to as..?

Answer 7

Ollier’s disease

Question 8

Multiple endochondromas + hemangiomas of soft tisse is called…?

Answer 8

Maffucci syndrome

Question 9

What is this radiographic sign?

Answer 9

Codman’s triangle

The triangular area of new subperiosteal bone that is created when a lesion, often a tumour, raises the periosteum away from the bone.

Question 10

What is this radiographic sign?

Answer 10

‘Sunburst’ periosteal formation (‘Hair on end’)

Question 11

What can you see in this film?

Answer 11

Fabella

Incidental finding of sesamoid bones in the back of the knee. They are sesamoid bones of the lateral head of the gastrocnemius.