Primary Ewing's Sarcoma of the Sinonasal Tract
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Ewing's sarcoma (EWS) is a highly malignant, small, round cell tumor that originated from the primitive neuroectodermal cells, as first described by James Ewing in 1921 . EWS of the bone, which most commonly occurs in children and young adults, accounts for approximately 3% of all pediatric cancers and most cases arise in the long bones or the pelvis. Primary EWS of the head and neck region is extremely rare, accounting for only 4–9% of all EWSs . Furthermore, sinonasal lesions are uncommon. Only 14 cases of EWS involving the nasal cavity or the paranasal sinuses have been reported in the world's otolaryngology literature . We herein present a case of EWS arising in the left ethmoid sinus....

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5301122/
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