Ectopic prostate tissue at the bladder trigone accompanied by cystitis glandularis and hemorrhage detected by multiparametric MRI.

Dear Editor, At the end of the 3rd month of embryonic development,the normal prostate derives from a series of endodermal buds from the lining of the future prostatic urethra.1 Ectopic prostatic tissue(EPT)is defined as the presence of prostatic tissue at sites other than expected.2 The precise origin of EPT is not entirely defined.Three theories have been proposed for this phenomenon,including migration and misplacement of normal tissue,persistent embryological remnants,and metaplasia of the transitional epithelium.1