Which type of tumor is commonly associated with hyperparathyroidism?

• A. Osteosarcoma
• B. Giant cell tumor
• C. Chondrosarcoma
• D. Fibrosarcoma

Answer: (B)

Giant cell tumors are frequently associated with hyperparathyroidism due to the influence of elevated parathyroid hormone (PTH) levels on bone metabolism. In hyperparathyroidism, increased levels of PTH can lead to bone resorption and subsequent formation of giant cell tumors, particularly in the epiphyseal regions of long bones. These tumors are characterized by the presence of multinucleated giant cells and can occur in the context of increased osteoclastic activity that follows the hormonal changes induced by hyperparathyroidism.

Other types of tumors listed do not have a strong or direct link to hyperparathyroidism. Osteosarcoma, chondrosarcoma, and fibrosarcoma have distinct pathophysiological mechanisms that are not influenced the same way by hormonal levels, and they typically arise due to different factors such as changes in bone turnover, genetic predisposition, or previous conditions such as Paget's disease, rather than a direct consequence of altered parathyroid hormone activity.