PMC3742136_01
Numerous cysts in the kidney (left panel) with part of a tumour in the right upper corner of the kidney. A large haemorrhagic tumour in the upper pole of the kidney (right panel) with renal vein invasion by tumour (arrow).
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The kidney (140x85x40 mm) contained numerous cysts up to 30mm in maximum extent (Figure 1). A relatively circumscribed, partly necrotic tumour with haemorrhage and necrosis, 60x55 mm is was noted in the upper part of the kidney with extension into the renal vein and peri-hilar fat (Figure 1).
Kidney with simple cysts, tubular atrophy and interstitial fibrosis with mild inflammation (left panel) and clear cell renal cell carcinoma within the renal vein, as arrowed in the right panel.
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The remainder of the kidney shows numerous simple cysts, each lined with a layer flattened cuboidal cells (Figure 2).