<prompt> Macrophage activation syndrome IS seen in association with?Systemic sclerosisSweets syndromePolyaeritis nodosaSLE  <response>: Macrophage activation syndrome MAS is a life-threatening complication of rheumatic disease that, for unknown reasons, occurs much more frequently in individuals with systemic juvenile idiopathic ahritis SJIA and in those with adult-onset Still disease. Macrophage activation syndrome is characterized by pancytopenia, liver insufficiency, coagulopathy, and neurologic symptoms and is thought to be caused by the activation and uncontrolled proliferation of T lymphocytes and well-differentiated macrophages, leading to widespread hemophagocytosis and cytokine overproduction . Ref - reseaechgate.net 