Chemo-Nonresponsive Telangiectatic Osteosarcoma With Oligometastatic Recurrence Managed With Multimodality Therapy Including Stereotactic Ablative Body Radiotherapy (SABR): A Case Report With a Pathologic Treatment Effect. - Orr WS; Vijayakumar S; Al Hmada Y; Mobit P; Collier AB; Barr J; De Delva PE; Davis DB; Yang CC; Nittala R (Cureus, 2026)