1Fulton RS, Rouse RV, Ranheim EA. Ectopic prostate: case report of a prosacral mass presenting with obstructive symptoms. Arch Pathol Lab Med ,2001,125:286-288.
2Yajima I, Ogawa H, Yamaguehi K, et al. Ectopie prostatic tissue in the bladder. Hinyokika Kiyo, 1993,39:761-764.