An eight-year-old boy was brought with pain and swelling over the right arm since three weeks. The pain was dull, progressive and aggravated at night. The parent gave history of intermittent low-grade fever since one month.
Frontal radiographs of the left arm in an immature skeleton show a permeative lytic lesion involving the distal metaphysis and diaphysis of the left humerus. There is lamellated periosteal reaction. The cortex is irregular and thinned with a soft tissue swelling adjacent to the lesion.
Ewing's sarcoma
Named after James R. Ewing, an American pathologist who first described the tumor in 1921