Orthopaedic oncology

Question 1

Benign epiphyseal tumours

Answer 1

Chondroblastoma

GCT

Question 2

Benign metaphyseal and diaphyseal tumour

Answer 2

Simple bone cyst
Osteochondroma
Enchondroma
Osteoid osteoma

Question 3

Malignant bone tumour

Answer 3

Osteosarcoma
Chondrosarcoma
Ewing/ primitive neuroectodermal tumour

Question 4

What is GCT

Answer 4

On metaphyseal side of physis, expanding into epiphysis as a juxta-articular eccentrically placed lytic lesion with internal septation

Question 5

What is most common benign bone tumour

Answer 5

Osteochondroma

Question 6

What is Osteosarcoma

Answer 6

Peak in childhood and adolescence, and further peak in later years (associated with Paget’s diseases)
Commonly affect knee (50%) and humerus (25%)
Xray: Increased intramedullary sclerosis with permeative destruction
Elevaation of periosteum