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A chondroblastoma of the proximal humerus in a 15-year-old boy was removed en bloc due to its very large size and locally destructive, aggressive character. This case is reported because of the rarity of chondroblastomas excised en bloc; specimens were examined in detail by correlated roentgenographic, gross inspection, histologic and electron-microscopic methods.
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Mirra et al. (1983) studied this question.
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