Chin,E , , Abu Bakar,A , , Hitam,S , , Kah Wai,N , and Abdullah,M . "Primary Extraosseous Ewing Sarcoma of the Maxillary Sinus in an Adult-A Rare Case Report", Iranian Journal of Otorhinolaryngology, 31, 6, 2019, 391-397. doi: 10.22038/ijorl.2019.35555.2173