Abstract: Prolapse of ureterocele through the urethra is rare. To our knowledge, the following is the first case report of prolapsing ureterocele in a male and is of special interest because the lesion was demonstrated only by cine voiding cystourethrography. In 1944 Emmett and Logan (5) in a rather comprehensive review of the literature found only 37 cases, all in females. Since that time several other cases have been reported (2, 8–10), all in females. In most of these patients the prolapsed ureterocele presented through the external meatus. There has been some controversy in respect to the optimal method of recording the voiding cystourethrogram. Some authors (4, 11) maintain that serial spot-films with conventional image-intensification fluoroscopy give adequate information at relatively low dose and furnish better detail than do cine studies. Advocates of the cineradiographic method, on the other hand, claim that motion studies permit evaluation of dynamic phenomena (6). Our approach combines the advantages of...