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The line of demarcation between the substantia nigra and the crus cerebri (A–C): the 40-year-old male subject; (D–F): the 70-year-old female subject). T1-weighted hyperintensity corresponds exactly to the extent of the substantia nigra delineated by myelin staining (luxol fast blue) without overlapping with the adjacent crus cerebri. The ventral hypointense layers visible in T2*-weighted images extended anteriorly to the posterior part of the crus cerebri.
