Figure 2.

A 70-year-old man with autopsy-confirmed collecting duct carcinoma and bony metastases. A. Unenhanced computed tomography shows a poorly defined medullary tumor with infiltrative growth. The renal contour is intact. B. Early phase enhanced computed tomography scan reveals mild enhancement of the lesion. C. Delayed phase enhanced computed tomography scan reveals mild enhancement of the lesion. D. Computed tomography shows osteolytic (thin arrows) and osteosclerotic lesions (thick arrows) in the ilium and sacrum. E. Photomicrograph (×200, hematoxylin and eosin stain) demonstrates osteosclerotic changes (thin arrows) and tumor cells (thick arrows). F. Photomicrograph (×200, hematoxylin and eosin stain) shows osteolytic changes (thin arrows) and tumor cells (thick arrows).