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Ewing Sarcoma is a rare, aggressive cancer of the bone or soft tissue, and is most often found in children and teenagers. It is the second most common bone cancer in this age group, typically forming in the long bones of the legs or the pelvis.
read more about ewing sarcoma for children ...This cancer in children is defined by its rapid, malignant growth usually arising in the diaphysis (shaft) of long bones. Its definitive identification relies on finding the specific chromosomal translocation that drives its development.
Children with Ewing Sarcoma often develop persistent pain and swelling in one limb, usually around the long bones of the legs or pelvis. The pain may start mildly, leading parents or doctors to suspect a minor injury, but it gradually becomes constant and severe, especially at night or during rest. The affected area may feel warm, tender, or visibly swollen. A limp or reluctance to walk is common when the tumor involves the lower limbs. Systemic symptoms such as fever, fatigue, and unintentional weight loss may appear as the cancer progresses. In advanced cases, a firm mass can be felt under the skin, and fractures can occur easily due to the weakening of the bone.
Genetic analysis is central to confirming the diagnosis. The presence of the specific EWS-FLI1 fusion gene (resulting from the chromosomal translocation) identifies the cancer type and helps guide the treatment strategy.
Treatment is intensive and multi-phase. Children receive chemotherapy first to reduce the tumor size, followed by definitive treatment (surgery or radiation therapy) to remove or kill the remaining tumor, and then further chemotherapy to prevent recurrence.
This cancer can directly impact eye health if the tumor grows in the bones of the eye socket (orbit). This orbital involvement can cause pain, severe proptosis (bulging of the eye), displacement of the eyeball, and loss of vision due to nerve compression.
No, osteosarcoma is another type of bone cancer, but they are genetically and pathologically distinct.
The prognosis has improved significantly with modern chemotherapy protocols, but the outlook depends on whether the cancer has spread.
Amputation is rarely necessary. Doctors prioritize limb-sparing surgery whenever possible.
If your child develops a limp or a "soft tissue mass" near a joint, do not assume it is a "growing pain." Ewing Sarcoma is a medical emergency. Rapid imaging with MRI and CT is required to stage the disease and begin induction chemotherapy to shrink the tumor.
National Cancer Institute. Ewing Treatment - Patient (cancer.gov). 2025.
Nationwide Children's Hospital. Ewing Sarcoma (nationwidechildrens.org). 2025.
American Cancer Society. Ewing Tumor Overview (cancer.org). 2021.
NCBI Bookshelf. Pediatric Ewing Sarcoma (ncbi.nlm.nih.gov). 2018.