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Red marrow replacement on a lumbar MRI indicates the substitution of normal fatty marrow with hematopoietic (blood-forming) tissue, often due to various conditions such as anemia, infections, or malignancies. This change can suggest underlying pathology, such as increased demand for blood cell production or infiltration by abnormal cells. It's crucial to correlate these findings with clinical symptoms and possibly further investigations to determine the underlying cause.

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1w ago

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