PMC3382261_01
Oncocytoma. Note the archipelaginous architectural pattern with oncocytic cells (hematoxylin and eosin; original magnification x 40).
CRIM.UROLOGY2012-307813.001.jpg
PMC3382261_01_CRIM.UROLOGY2012-307813.001.jpg
fig1
Microscopic examination of the renal tumor revealed areas typical of an oncocytoma with an archipelaginous architectural pattern near the center of the tumor (Figure 1).
A second population of cells with malignant cytologic features is noted admixed within the oncocytoma (hematoxylin and eosin; original magnification x 200).
CRIM.UROLOGY2012-307813.002.jpg
PMC3382261_01_CRIM.UROLOGY2012-307813.002.jpg
fig2
In addition to the oncocytic cells, a second population of cells arranged in small groups containing high nuclear/cytoplasmic ratios, nuclear hyperchromasia, occasional prominent nucleoli, and rare mitoses were noted (Figure 2).