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Osteonecrosis (arrow) characterized by crescentshaped area in a coronal T1 (a). T2 sequence with fat saturation (b) is surrounded by a double line sign (central hyperintense and peripheral hypointense signal). In the post-contrast T1 phase with fat saturation (c), the area of necrosis shows no enhancement, persisting with very low signal. The bone marrow edema (*) is characterized by an intermediate signal on T1, and hyperintense on the T2 and on the post-contrast phase.
