Systemic Lupus Erythematosus (SLE) with Acute Nephritis, Antineutrophil Cytoplasmic Antibody- (ANCA-) Associated Vasculitis, and Thrombotic Thrombocytopenic Purpura (TTP): A Rare Case Report with Literature Review

系统性红斑狼疮（SLE）合并急性肾炎、抗中性粒细胞胞浆抗体（ANCA）相关性血管炎和血栓性血小板减少性紫癜（TTP）：一例罕见病例报告及文献复习