Figure 5
From: IgG4-related systemic disease mimicking renal pelvic cancer: a rare case
Postoperative images. (a) Gross examination of the kidney showed a 5 × 2.5–cm, pale, whitish-tan, ill-defined mass located in the renal pelvis near the renal hilum. (b) Histological section of the renal mass shows lymphatic tissue hyperplasia and diffuse infiltration of plasma cells. (c) Histological section of the renal mass showed immunoglobulin G (IgG)-positive plasma cells (anti-IgG antibody stain). (d) Histological section of the renal mass showed IgG4-positive plasma cells (anti-IgG4 antibody stain). The IgG4/IgG ratio was approximately 40%.