Diffuse Alveolar Hemorrhage after Receiving Oral Levonorgerstrel for Emergency Contraception: A Case Report.

DAH has not been reported as an adverse effect of LN until now. However, LN has been found to exert immunomodulatory effects and to present potential for manifestations of vasculitis as well as severe hypersensitivity reactions. These mechanisms may have been implicated in the development of DAH in our patient, who presented no other pathological conditions.