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

Dear Editor,At the end of the 3^(rd)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 EPT is relatively rare,and mostly occurs in the lower male genitourinary tract and occasionally in the female genitourinary tract.3 EPT symptoms are nonspecific,e.g.,hematuria,elevated urinary frequency,and nocturia.3 Heretofore,EPT cases at the bladder have been reported in literature,involving the bladder neck,trigone,interureteric ridge,and dome.2,4 However,to our knowledge,no study has described an EPT at the bladder trigone accompanied by cystitis glandularis(CG)and hemorrhage,detected by multiparametric magnetic resonance imaging(MRI).This case report suggests that multiparametric MRI could provide valuable imaging data for preoperative diagnosis of EPT.