VEGFA and vasculitis: Medications, such as hydralazine or allopurinol, may also trigger secondary vasculitis that could induce DAH.[13] Of the chemotherapeutic agents, bevacizumab is presumed to induce DAH through a possible mechanism of inhibition of the vascular endothelial growth factor (VEGF) with resultant fragile capillaries.[14,15] However, bevacizumab had not been used in the treatment for this patient.