I have spondyloarthritis from last 3 years. My recent MRi report states that there are fat replacement in the SI joints. What does this mean? Is it something to worry about? I am unable to find any results for this in the net also.
The MRI probably refers to ‘marrow fat replacement’ which is a common association of spondyloarthropathies along with bone marrow edema, joint erosions, and ankylosis; though it may be seen in a few normal individuals as well as a few non-specific conditions.
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Aside being normal in some cases, few drugs, chronic infections, radiation, demineralization, increased age, a few hormonal/ endocrine disorders etc. can cause similar changes. Similar appearance can also be caused due to issues that interfere with signal intensity on the MRI.
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