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Summary

3 additional cases of “nephrogenic adenoma” of the bladder are added to the 20 previously reported cases.

Light and electron microscopic studies of the first 2 cases support the hypothesis of urothelial metaplasia. The name “adenomatous metaplasia” should replace “nephrogenic adenoma”.

Malignant change occurred in the third case, suggesting that this ought to be regarded as a potentially dangerous form of metaplasia.

In the absence of malignant change, ileocaecocystoplasty with subtotal cystectomy afforded symptomatic cure in 2 cases: radical cystectomy was performed in the third because of malignant adenocarcinoma.