PMC3639678_01
The view of the cystic, thick-walled, septated, and vascularized mass at the arterial phase of the computed tomography.
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fig1
Computed tomography identified a 14 x 11 cm cystic, space-occupying formation with many thick septae, which originated from anterior cortex of the left kidney and reached the level of pelvic inlet (Figure 1).
(a) Tumor tissue and intact parenchymal tissue (x40 hematoxylin-eosin). (b) The tumor cells with ovoid, round nuclei having coarse chromatin structure and a narrow eosinophilic cytoplasm (x400 hematoxylin-eosin).
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fig2
Microscopically, tumoral cells had ovoid, round nuclei, coarse chromatin structure, and a narrow eosinophilic cytoplasm (Figure 2).
Immunohistochemical staining: (a) CD34 positive (x40), (b) CD99 positive (x100), and (c) staining showing a proliferative index of 1% with Ki-67 (x400).
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fig3
Less than 1% of cells showed nuclear positivity with Ki-67 (Figure 3).