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Light and electron microscopy, kidney biopsy from patient 1. (a) Hematoxylin and eosin stain showing endocapillary segmental hypercellularity. (b) PAS stain showing crescent formation. (c) DIF showing granular mesangial IgA staining (+2). (d) Electron microscopy showing segmental mesangial and paramesangial immune deposits. DIF: direct immunofluorescence. IgA: immunoglobulin A. PAS: periodic acid-schiff.
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IF was positive for granular mesangial deposits of IgA, and electron microscopy revealed mesangial immune deposits (Figure 1).
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