FIGURE 2 Accumulation of epithelial cells separated from the surface epithelium by a stromal border, also known as a von Brunn cell nest
From the following article:
A case of florid cystitis glandularis
Michelle Jo Semins and Mark P Schoenberg
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Figure 2. Accumulation of epithelial cells separated from the surface epithelium by a stromal border, also known as a von Brunn cell nest
In cystitis glandularis, the central cells degenerate and there is a central lumen surrounded by a continuous layer of columnar epithelium.3, 10 Hematoxylin and eosin stain, magnification 
20.