Primary pure osteosarcoma of the breast is a rare malignant tumour and is histologically indistinguishable from conventional osteosarcoma of the bone and other extraskeletal sites. Being a rare entity that is briefly reported in the radiology literature, it has some interesting imaging features worthy of discussion. Here we report the novel findings of dynamic contrast-enhanced MRI (DCE-MRI), diffusion weighted imaging and MR spectroscopy of primary breast osteosarcoma which has never been previously reported.
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