CT of renal metastatic disease. A pictorial essay

The routine use of computed tomography (CT) for the staging and follow-up of malignant neoplasm has improved the detection of secondary spread to the kidneys. This essay illustrates the gamut of the CT aspects of such secondary lesions. Seven main patterns of metastatic features are identified. Some of these patterns appear to reproduce the same radiological features seen in the corresponding primary lesions. Where feasible, differential diagnostic criteria are offered.