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8945 Orthopaedics

A 12 year old girl complains of pain persisting in his leg for several weeks with a low grade fever. A radiograph reveals a mass in the diaphyseal region of the left femur with overlying cortical erosion and soft tissue extension. A biopsy of the lesion shows numerous small round cells, rich in PAS positive diastase sensitive granules. The most likely histological diagnosis is :

AOsteogenic sarcoma.
BOsteoblastoma.
CEwing's sarcoma.
DChondroblastoma
Orthopaedics
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