Low back pain. MRI not possible - bone stimulator in situ to promote healing of non-united spontaneous femoral fracture.
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Typical "rugger jersey" spine with dense posterior appendages and bilateral pars interarticularis defects from L1 to L5 - note only mild anterior spondylolithesis at L5/S1.
Typical well-defined pars defects through very dense bone at all lumbar levels.
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This patient has known osteopetrosis (marble bone disease).