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Noninvasive imaging of renal masses has improved in recent years. Five different techniques are now available for a stepwise diagnostic procedure. While renal ultrasound and color Doppler sonography are used for tumor screening, computed tomographic angiography remains the imaging technique of choice for grading and classifying cystic and solid renal masses. In patients with allergies to iodinated contrast media or with renal insufficiency, magnetic resonance tomography (MRT) can play a major role, especially for cystic renal masses. However, nephrogenic systemic fibrosis has been recently described in more than 200 cases after MRT-associated application of gadolinium-based contrast media, thus currently limiting the use of MRT. Positron emission tomography should be limited to patients under surveillance or with suspected metastatic lesions. Recent developments in imaging techniques with new classifications to improve diagnostic accuracy are discussed in this article.