Home > E. Pathology by systems > Urinary system > Urinary bladder > Brunn nest

Brunn nest

Wednesday 25 January 2012

islets of von Brunn; islet of von Brunn; Brunn’s nests

Digital slide

- Cystic islets of von Brunn : NCK8-184 (ICSFramework)

Digital case

- HPC:362 : Cystic islets of von Brunn

Brunn nests, cystitis cystica and cystitis glandularis are reactive urothelial changes commonly encountered in bladder specimens. Brunn nests are invaginations from the overlying urothelium into the lamina propria.

When Brunn nests become cystically dilated (with or without eosinophilic secretions in the lumen) - this change is referred to as cystitis cystica. When the urothelial cell nests show a central lumen lined by glandular epithelium, it is referred to as cystitis glandularis. Most areas of cystitis cystica and cystitis glandularis are microscopic.

In some cases, florid cystitis cystica and cystitis glandularis may form polypoid masses that clinically mimic urothelial neoplasia.