High-grade (Grade III) soft tissue sarcomas are significantly more aggressive than their lower-grade counterparts. These tumours arise from the same connective tissue cell types — fibrous tissue, peripheral nerves, blood vessel walls, fat, or muscle — but grow more rapidly, invade surrounding tissues more deeply, and have a much higher chance of spreading to the lungs and other distant sites. Without adequate surgical margins, the local recurrence rate is approximately 75%. Treatment typically involves wide surgical excision combined with radiation therapy and sometimes chemotherapy to address both local and distant disease. Importantly, any soft tissue sarcoma that has been incompletely excised also warrants aggressive follow-up treatment, regardless of its original grade, because residual tumour cells left behind have a very high likelihood of regrowth.