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Histological findings of Hematoxylin and Eosin (H&E) staining and immunohistochemistry. H&E staining revealed hemangioma-like vascular structures (low magnification: A, high magnification: B). These structures were positive for CD34 (C). Marked infiltration of inflammatory cells was observed in the tubulointerstitial area (D), which contained many IgG4-positive cells (E). Additionally, interstitial fibrosis and sclerotic glomeruli were noted (F) (Scale bars: A, 1,000 μm; B-F, 100 μm).
