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MRI shows L1 and L2 vertebral bodies collapse.
Bone marrow is diffusely and uniformly hypointense on T1W and hyperintense on STIR. At this age, the red marrow should be replaced by the yellow one, indicated by the fatty signal in the bone marrow. This case shows the conversion of the normal yellow marrow into the red marrow. Note that on STIR, bone marrow also has higher signal intensity than skeletal muscle.