Large yellow-tan mass surrounded by white arrows is the tumor.
Yellow nodules are normal fat around shoulder.
Tumor has undergone central necrosis as indicted by the dark arrow near the center. The metastases arise as part of the natural history of malignancies in various organs. The resorption of bone seen in the vicinity of tumor metastases is believed to be due to activation of osteoclasts by cytokines aberrantly secreted by tumor cells. Similarly, excess mineralization seen in some cases of tumor deposits in bone is also due to inappropriate cytokine release from the tumor cells. Malignancies of various organs and tissues commonly metastasize to bone.