Concurrent pulmonary hemorrhage and deep vein thrombosis in a child with ANCA-associated vasculitis: case report and review of literature.

Antineutrophil cytoplasmic antibody-associated vasculitis (AAV) is an uncommon but potentially life threatening disease in children. Pulmonary hemorrhage (PH) is a well recognized but lethal complication. The incidence of venous thromboembolism (VTE) is higher in patients with AAV, especially in those with active disease. However, the simultaneous occurrence of both PH and VTE has rarely been reported. Herein, we describe a 14-year-old female with AAV who developed concomitant deep vein thrombosis (DVT) and PH within 3 days after hospitalization. She was successfully treated with timely plasmapheresis and methylprednisolone pulse therapy. VTE did not occur during discontinuation of anticoagulant. On reviewing the English literature, 5 AAV patients with coexisting VTE and PH have been reported. When faced with PH, whether or not to keep anti-coagulation treatment is a dilemma. Some of the patients kept receiving anti-coagulation treatment, whereas others undergoing inferior vena cava filter implantation. Glucocorticoids and cyclophosphamide or other immunosuppressant agents were prescribed in all patients. All of the cases survived after treatment for concurrent VTE and PH, and received short- or long-term anticoagulation treatment after discharge. To the best of our knowledge, this is the first report of a pediatric patient with AAV presenting with coexistent VTE and PH. VTE should be considered to be a sign of disease flare-up, and early plasmapheresis with immunosuppressant therapy can rescue this fatal complication.