case_images: PMC4531988_01
case_images: Light microscopy shows a slight increase in size of the glomeruli but otherwise no abnormal findings are observed (H&E x100).
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case_images: PMC4531988_01_kjim-12-2-232-16f1.jpg
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case_images: Under light microscopy, his renal tissue showed no abnormal findings except slightly increased size in all 15 glomeruli (Fig. 1).
case_images: Postcontrast CT scan reveals that the mass is a mixture of highly attenuated solid portions and low-attenuated necrotic portions. The outer margin of the mass is discrete and no intra-abdominal lymph node enlargement is observed.
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case_images: PMC4531988_01_kjim-12-2-232-16f2.jpg
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case_images: No intra-abdominal lymph node enlargement was seen (Fig. 2).
case_images: Anintravenous urography, the right kidney is rotated upward on the frontal plane, but no abnormal finding is seen in the shape of calyx, pelvis and ureter, nor the excretory function of both kidneys.
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case_images: On intravenous urography, the right kidney was rotated upward on the frontal plane but the shape and the excretory function were normal (Fig. 3).
case_images: A cross surface of the removed mass shows it to be a fairly well-circumscribed mass with fascicles of fibrous tissue and two areas of cystic change.
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case_images: Cross scetions showed cystic and mucoid degeneration in the fibrotic bundles (Fig. 4).
case_images: Photomicrographs of the mass show irregular fibrous bands and scattered inflammatory cell collections (H&H x100).
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case_images: Seen through the light micorscope, most part of the tissue had dense deposits of collagen fiber and fibroblast proliferation but, at the periphery of the mass, there were localized inflations of inflammatory cells such as lymphocytes, plasma cells and histiocytes, forming germinal centers (Fig. 5).