[Carcinoma in situ of the urethra]

A case of carcinoma in situ of the male urethra is reported. Incidence, morphology, etiology and clinical significance of this tumorous lesion are discussed. Between transitional cell carcinoma of the urinary bladder and urethral carcinoma in situ there is a relative high coincidence. This requires diagnostic and therapeutical procedures to prevent the development of an invasive carcinoma of the urethra.