Cross-sectional imaging in ureter tumors: findings and staging accuracy of various modalities.

We present cross-sectional imaging findings in eight patients with ureter tumors. Eight patients were examined by computed tomography (CT), seven by ultrasonography (US), and five by magnetic resonance imaging (MRI). All the lesions were detected by the three modalities. All modalities were accurate in excluding the periureteral invasion and lymphadenopathy in Stages 1 and 2 tumors. While CT and MRI identified the periureteral invasion and lymphadenopathy in four patients with advanced tumors, US failed to show the local invasion in three of four patients. Nevertheless, enlarged retroperitoneal lymph nodes could be detected sonographically in the three Stage 4 tumors. CT and MRI appear to have a high diagnostic sensitivity and staging accuracy in ureter tumors. Although US detects ureter tumors efficiently, this technique seems to be unreliable in showing local invasion in a substantial number of patients.