Imaging Review of Skeletal Tumors of the Pelvis Malignant Tumors and Tumor Mimics
Figure 4
Metastasis. A 58-year-old male presents with a short history of right hip pain and a remote history of primary renal cell carcinoma diagnosed with metastases. Axial post-contrast CT of the pelvis (a) demonstrates a large destructive expansile necrotic mass (asterisk), arising within the right ilium and extending into the right sacrum. Two different patients with breast cancer metastasis to the acetabulum (b) and (c) and to the sacrum (d) and (e). These lytic lesions can be difficult to identify on plain films (b) and (d) more easily appreciated on coronal STIR (c) and sagittal T1 (e) MRI. Note the destruction of arcuate lines by the sacral lesion; destruction of the subarticular cortex, asymmetric density of the right acetabulum, and fuzziness of the right iliopectineal line by the acetabular metastasis.
