Peritoneal metastases happen when cancer spreads to the lining of the abdominal cavity. This is usually a finding associated with advanced or already-known cancer rather than in otherwise healthy, asymptomatic individuals. In rare cases, small peritoneal deposits may be identified unexpectedly on imaging before obvious symptoms have developed. An MRI may show changes in the abdominal lining that could be consistent with secondary spread. Identifying peritoneal metastases early may allow for faster staging and treatment planning. MRI can detect peritoneal deposits, though CT is often used first for suspected peritoneal disease. MRI provides valuable soft tissue detail for characterisation.
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