Multicentric Giant Cell Tumor of Bone: Metachronous Presentation-a Case Report.

Giant cell tumors (GCT) of bone are a benign aggressive tumor with features of frequent local recurrence. It has the potential for metastasis and malignant transformation. GCT of bone represents about 4-9.5% of primary bone tumors. Metachronous GCT happen in less than 1% while metastatic spread in these lesions is very uncommon. Furthermore, reports of multicentric metachronous GCT are very rare in literature. We present a case of a 35-year-old male patient, who suffered from multicentric metachronous GCT, which involved the radius, humerus, femur, and pelvic with pulmonary metastasis. Local control by multiple resections of the tumor and chemotherapy for pulmonary metastases was able to control the disease with long-term survival and good functional outcome. These tumors had a typical radiological appearance and the diagnosis was confirmed on histopathology. Long follow-up needed in this case in view the illness occurs for long period. © Indian Association of Surgical Oncology 2021.