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Magnetic resonance imaging is essential for urological imaging. It offers excellent soft tissue contrast and resolution, allowing manipulation of tissue contrast with different image weighting and sequences. The multiplanar aspect of MRI allows image acquisition in different planes and degrees of obliquity to best exhibit pathology. The basic physics of MRI is explored initially with explanation of image weighting, sequences, and diffusion-weighted imaging. The chapter is then divided into renal, bladder, and prostate MRI imaging. The paragraphs on renal MRI outline renal mass analysis and include characterization and assessment of cystic and fat-containing lesions. Staging of renal carcinoma with MRI is also discussed, along with its advantages compared with CT staging. Throughout the text, the key diagnostic MRI features with each disease and organ, and the pitfalls and caveats of MRI imaging are emphasized.