Primary osteosarcoma of the calcaneus in an elderly patient: Case report and brief literature review

Osteosarcoma is the most prevalent primary malignant bone neoplasm, defined by the direct production of osteoid by tumor cells. Its typical localization involves the metaphysis of long bones, with a predominance in the knee region and the proximal humerus. Involvement of the foot is exceptional, and calcaneal engagement accounts for less than 1% of reported cases. We present the case of a 77-year-old female patient with primary osteosarcoma of the right calcaneus, whose initial clinical presentation mimicked a post-traumatic lesion, resulting in a delayed diagnostic suspicion. The clinical, diagnostic, and therapeutic particularities of this infrequent anatomical site are analyzed, with an emphasis on the management challenges in patients of advanced age.