Renal Pelviceal Keratinizing Squamous Metaplasia with Sparing of Pyramidal Zones

Figure 2

Histologic findings at 40x (a) show H&E stained transition zone between renal parenchymal stroma (top) and renal pelviceal stroma (bottom); (b) shows metaplastic epithelial component is negative for CK5+; (c) shows CD7+ positive staining of metaplastic component; (d) shows extensive desquamative squamous metaplasia over densely collagenized pelviceal stroma.