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186529 Surgery

A 33-yr old man presented with a slowly progressive swelling in the middle 113d of his right tibia. X-rays examination revealed multiple sharply demarcated radiolucent lesions separated by areas of dense and sclerotic bone. Microscopic examination of a biopsy specimen revealed island of epithelial cells in a fibrous stroma. Which of the following is the most probable diagnosis?

AAdamantinoma
BOsteofibrous dysplasia
COsteosarcoma
DFibrous coical defect
Surgery
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