Malignant urachal lesions are exceedingly rare and occur predominantly in adult life. In this ease report, an adult patient with urachal carcinoma is presented with abdominal plain film, intravenous urography. gray-scale ultrasonography (US). Doppler US, and computed tomography (CT). Doppler US successfully showed the neovascularity with low resistive index value in the urachus tumor. We believe that Doppler US examination is helpful in the differential diagnosis of Urachal carcinoma. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.