Recent technologic advances in MR imaging may affect these results. CONCLUSION: CT was more accurate than MR imaging in detection and characterization of transmural penetration of rectal tumors. The accuracy of MR imaging and of CT (85% for each) are better for evaluation of liver metastases lower sensitivities (62% and 70%, respectively) than specificities (97% and 94%, respectively) were demonstrated for both modalities. Un estudio del trnsito esofagogastroduodenal es una clase de radiografa que ayuda a los mdicos a averiguar cmo funciona su sistema digestivo. CT and MR imaging exhibited accuracies of 62% and 64% in assessment of lymph node involvement with sensitivities of 48% and 22%, respectively. Accuracies of CT and MR imaging were equivalent in depiction of transmural extent in colon cancers. ![]() De esta manera, el contraste es útil para resaltar (contraste positivo) u opacar (contraste negativo ciertos tejidos y estructuras. ![]() Dependiendo de la sustancia, el contraste ayuda a que el tejido absorba más o menos radiación. ![]() RESULTS: In the staging of local extent of tumor, CT is more accurate than MR imaging, particularly in the definition of penetration of the muscularis propria by rectal cancer (74% vs 58%). Los medios de contraste son sustancias que permiten mejorar la visibilidad de los tejidos en las imágenes. The accuracy of each modality was assessed in a subset of 365 patients with primary tumors with respect to staging of local extent of tumor, status of local-regional lymph nodes, and the presence of liver metastases. MATERIALS AND METHODS: CT and MR studies were independently interpreted in a group of 478 patients with colorectal carcinoma in a study conducted from 1989 to 1993. El esofagograma es un estudio radiológico diná- mico del tracto digestivo superior que utiliza un medio de contraste y aire (doble contraste) y permite realizar una aproximación diagnóstica de anomalías estructurales y funcionales del esófago. PURPOSE: To prospectively evaluate the relative accuracy of computed tomography (CT) and magnetic resonance (MR) imaging in the staging of colorectal carcinoma.
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