Four cases of a locally invasive sarcoma of the chest wall are described in children aged between 8 and 14 years. Although its morphology resembles a Ewing's sarcoma of bone there are light and electron microscopical features that are distinctive. The sarcoma is thought to represent an entity which has not previously been defined. Its clinical importance lies in the fact that the prognosis with appropriate treatment appears to be good. One child died after 2 1/2 years, but the others are alive 6, 8, and 16 years after presentation.

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