Invasive verrucous carcinoma of urinary bladder treated by irradiation

A case of inoperable, invasive verrucous carcinoma of the urinary bladder treated by irradiation is presented. The incidence of anaplastic transformation of verrucous carcinoma after irradiation is lower and the coincidence of verrucous carcinoma and well-differentiated squamous carcinoma higher than is generally recognized. Radiation should be considered in inoperable cases. The pertinent literature is reviewed.