Different: A tumor stands out on MRI because it looks different from the tissues around it. Also, it may have bled, invaded surrounding tissues, or enhance with contrast in such a way that it is conspicuous.
Answered 12/24/2016
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A mass: A tumor by definition is a swelling. And i tend to agree it might look different. Mri uses many different pulse sequences to image your body. The tumor can stand out on some sequences and on others can look the same as surrounding tissue. This makes interpretation difficult. But most tumors have mass effect. Rarely they will be infiltrating and have no mass effect. Your doctor can show you.
Answered 6/19/2015
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