n :  a tumor that invades the shaft of a long bone and that tends to recur but rarely metastasizes - called also Ewing's tumor 
 
Ewing, James (1866-1943), American pathologist. Ewing was a recognized authority on the diagnosis and management of neoplastic diseases and the author of a standard text on the subject. His description of reticulum cell sarcoma was published in 1913. He described the disease now known as Ewing's sarcoma or tumor in 1921.
 
 
 
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