EBRT can play an important role in the management of Ewing sarcoma and osteosarcoma. For Ewing sarcoma, radiotherapy is commonly used pre-operatively to sterilize the tumor bed, post-operatively for positive or close margins, or definitively when surgery is not possible. Treatment planning aims to cover the pre-treatment tumor volume plus a 2-2.5cm margin using IMRT or 3D-CRT. For osteosarcoma, radiotherapy can be used definitively for unresectable tumors or adjuvantly after surgery if margins were positive. A dose of 70.2Gy is typically prescribed for definitive cases and 64.8Gy for