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Fang and colleagues invesitgated the association of magnesium levels with posterior reversible encephalopathy syndrome in patients with preeclampsia or eclampsia after 20 weeks of gestation or within 6 weeks postpartum [1]. Their results are consistent with previous studies that hypomagnesemia frequently occurs in the acute phase of obstetric posterior reversible encephalopathy syndrome [2]. Due to the retrospective nature of the study, some concerns may arise.