This is a case of a Filipino patient with necrotic soft tissue sarcoma (fibrosarcoma) on the thigh that developed tetanus. This case report intends to instill awareness that tetanus can occur in tumors and not just in traumatic wounds. Literature search was made obtaining no local reports and foreign literature showed that though uncommon, tetanus could occur in tumors, especially in those that developed necrosis. Recommended preventive measures include early treatment of the tumor before necrosis sets in and if necrosis has occurred,early treatment, usually by surgical extirpation and anti-tetanus prophylaxis.