Imaging Findings of Sacral Tumors

canal tumors and, most commonly, metastases. The most common primary malignant bone tumor is chordoma, and the second most common is giant cell tumor. The presence of multiple lesions involving the sacrum and other bones suggests metastasis or multiple myeloma. Although the imaging findings of sacral tumors are nonspecific, a patient’s age and sex, and specific findings such as calcification or fluid-fluid levels, can help radiologists determine the differential diagnosis. The imaging findings may overlap, however, in which case the final diagnosis can be determined by biopsy. We illustrate the imaging findings of primary sacral tumors, emphasizing the MRI findings. Benign Bone Tumors