Q) A 16 year old boy presents with severe groin pain after kicking a football. Imaging confirms a pelvic fracture. A previous pelvic x-ray performed 2 weeks ago shows a lytic lesion with 'onion type' periosteal reaction. What is the lesion?
a) Giant cell tumor
b) Ewing's
c) Osteosarcoma
d) Osteomalacia
Question from theme of test 14