Abstract
The incidence of osteogenic sarcoma supervening upon Paget's disease is discussed. Paget's disease is common in Australia, but the author has seen only twenty-three cases of sarcoma complicating it, and considers that the incidence is under 2 per cent. of all cases of Paget's disease in N.S.W. Authors in Europe and America are quoted as giving higher figures. Three of the author's cases are described in some detail. In two of these the sarcoma is central, a rare occurrence. In the third, metastasis has occurred to another bone unaffected by Paget's. This conflicts with the statement that further sarcomatous involvement appears in bones which are the seat of osteitis deformans.

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