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Fig. 2A —Left femoral head of 25-year-old woman who received high-dose steroid therapy for systemic lupus erythematosus. Coronal T1-weighted MR image (TR/TE, 500/17) obtained 18 months after initiation of therapy and 2 weeks after onset of hip pain shows decreased signal intensity in femoral head. Necrotic volume calculated on sequential T1-weighted images is 24.5%.