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Fig. 2 | Diagnostic Pathology

Fig. 2

From: IgG4-related inflammatory pseudotumor of the renal pelvis involving renal parenchyma, mimicking malignancy

Fig. 2

Histologic features of the mass lesion. (a) High power view showing storiform fibrosis with diffuse and intense inflammatory cell infiltration, mainly plasma cells and histiocytes. (b) Obliterative phlebitis is evident in some areas of the mass lesion. (c) Tubulointerstitium adjacent to the mass lesion showing fibrosis with abundant plasmacytic infiltration. (d) Immunohistochemically, IgG4-positive plasma cells infiltrated both the mass lesion and tubulointerstitium

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Diagnostic Pathology

ISSN: 1746-1596

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