PMC2813616_01
A CT-scan shows a homogenous low-density area involving the left renal sinus that shows distortion and displacement of the pelvicalyceal system without hydronephrosis (arrows demonstrates).
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An abdominal CT scan showed a homogenous low density area involving the left kidney sinus that showed distortion and displacement of the pelvicalyceal system without hydronephrosis (Figure 1).
Gross appearance of lesion in renal pelvis. A well-circumscribed mass with a creamy-brownish appearance, hemorrhage foci in cut surface.
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The macroscopic appearance showed a multinodular tan-yellow hemorrhagic lesion involving the renal sinus and pelvicalyceal system (Figure 2).
A) Lymphocytes, plasma cells and numerous histiocytes with a large vesicular nuclei and abundant cytoplasm. Many of these histiocytes have within their cytoplasm numerous intact lymphocytes, a feature that has been designated as emperipolesis or lymphocytophagocytosis. (hematoxylin-eosin stain, original magnification x400). B) Renal pelvis involved by RD, note lymphocytes, plasma cells and numerous histiocytes with emperipolesis. The transitional epithelium is seen on the left of micrograph (hematoxylin-eosin stain, original magnification x400).
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The infiltrate also involved the renal pelvis and perinephric fat (Figure 3).
Immunohistochemical staining with S-100 protein revealing strongly stained histiocytes (IHC staining with S-100 protein, original magnification x800).
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Immunohistochemical staining with S100 protein revealed strongly stained histiocytes (Figure 4).