ABSTRACT
Purpose To investigate the clinicopathologic and immunohistochemical features,and differential diagnosis of nephrogenic metaplasia (NM).Methods The clinical data,histological and immunohistochemical characteristics of 6 cases of NM were analyzed,with review of the literature.Results There were 1 case of female,5 cases of male,aged from 31 to 81 years,with average of 58.1 years.The history revealed lithiasis of urologic tact in 2 cases,previous transurethral resection for benign prostatic hyperplasia or cystitis glandularis in 3 cases,and concurrent urothelial carcinoma in 1 case.The lesion involved in the ureter in 3 cases,prostatic urethra in 2 cases,and bladder trigone in 1 case.Cystoscopic examination demonstrated mucosal rough or low villous protrude.Microscopically,the lesion was consisted of tubules,cysts,small nests and papillary structures with basement membrane-like eosinophilic sheath,and lined by cuboidal,or low column epithelial cells with cytological atypia in some area,and shown inflammation in stroma.Immunohistochemically,there was positive staining for PAX2,PAX8,CK7 and P504S,negative for p63,CD10,and PSA.Conclusion NM is a rare tumor-like lesion often with injure of urologic tract,and should be differential with urothelial carcinoma,prostatic carcinoma,clear cell adenocarcinoma and endometriosis.It's important to know the clinicopathological and immunohistochemical features of NM for the correct interpretation.
