adj. 1. too small to be seen clearly without the use of a microscope. 2. of, relating to, or using a microscope.
(MPA) an autoimmune disease characterized by inflammation of small blood vessels, leading to reduced kidney function and breathlessness. It is associated with the presence of antinuclear cytoplasmic antibodies (*ANCA) and can be treated with corticosteroids, cyclophosphamide, or rituximab.... microscopic polyangiitis
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