Cystourethrography as a teaching aid for residents.
D001296:Audiovisual Aids; D006801:Humans; D007396:Internship and Residency; D008297:Male; D011470:Prostatic Hyperplasia / Q000000981:diagnostic imaging*; D014552:Urinary Tract Infections / Q000000981:diagnostic imaging*; D014567:Urography; D014572:Urology / Q000193:education