ABSTRACT
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Subject(s)
Humans , Male , Adolescent , Appendicitis/diagnosis , Ileitis/diagnosis , Incidental Findings , Diagnosis, DifferentialABSTRACT
OBJECTIVE: our aim was to evaluate the accuracy of endosonography (EUS) in our experience, to stage rectal cancer. MATERIAL AND METHODS: we prospectively included all patients with rectal cancer staged in our unit from September 2002 until February 2006 in a database. We selected those patients who had a complete EUS examination and were surgically treated without neoadjuvant therapy. Once we had the results of the histopathological staging (pTN), which was considered the gold standard, we compared the results of the previous EUS staging (uTN) with those of the pTN. We calculated the sensitivity, specificity, positive predictive value, negative predictive value and accuracy for each T stage, and for N staging considered as N positive or negative. We also calculated the global accuracy for T stage. We also calculated the agreement of uTN with pTN staging using the kappa index for N stage, and quadratic weighted kappa index for T stage. RESULTS: we staged 120 patients with rectal cancer during the mentioned period. Of these, 36 patients met inclusion criteria and were evaluated, 21 women and 15 men. Mean age was 68,53+/-10,15 yo (range: 48-90). Global T stage accuracy was 83%. N stage accuracy was 72%. We obtained a S, E, PPV, NPV and A of 91, 100, 100, 96 and 97% for T1; 82, 88, 75, 91 and 86% for T2; 86, 91, 86, 91 and 89% for T3; and 14, 86, 20, 80 and 72% for N stage respectively. Kappa value for T stage was 0,87 indicating a "very good" agreement between uT and pT according to the kappa index criteria. Kappa value for N stage agreement was 0,005; "poor" according to the same criteria. CONCLUSIONS: in our experience, the diagnostic accuracy of EUS for T and N staging of rectal cancer is 83% and 72% respectively, similar results as previously published. uT staging for rectal cancer shows a "very good" agreement with pT staging.
Subject(s)
Rectal Neoplasms/diagnostic imaging , Rectal Neoplasms/pathology , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Neoplasm Staging , Predictive Value of Tests , Prospective Studies , Reproducibility of Results , UltrasonographyABSTRACT
Objetivo: nuestro objetivo fue evaluar la precisión diagnóstica (PD) en nuestro medio de la ecoendoscopia (USE) para la estadificación del cáncer de recto (CR). Material y métodos: incluimos de manera prospectiva a todos los pacientes con CR estadificados en nuestra unidad entre septiembre de 2002 y febrero de 2006 en una base de datos. Seleccionamos aquellos pacientes en los que se había realizado una estadificación completa con USE(uTN) y fueron intervenidos quirúrgicamente sin tratamiento neoadyuvante. Consideramos la estadificación histológica (pTN) como patrón oro, y comparamos los resultados de la uTN previa con los de la pTN. Calculamos la sensibilidad (S), especificidad (E), valores predictivos positivo (VPP) y negativo (VPN) y PD para cada estadio T, y estadio N considerado como positivo o negativo. Calculamos la concordancia entre la uTN y la pTN utilizando el índice de kappa para el estadio N, y el mismo índice con ponderación cuadrática para el estadio T. Resultados: ciento veinte pacientes con CR fueron estadificados en nuestra unidad, cumpliendo 36 criterios de inclusión y fueron analizados en este estudio (21 hombres, 15 mujeres). La edad media fue de 68,53 ± 10,15 años (rango = 48-90). La PD de la uT global y uN fueron del 83 y 72% respectivamente. Obtuvimos una S, E, VPP, VPN y PD de 91, 100, 100, 96 y 97% para el T1; 82, 88, 75, 91 y 86% para el T2; 86, 91, 86, 91 y 89% para el T3; y 14, 86, 20, 80 y 72% para el estadio N respectivamente. El índice de kappa para la estadificación T fue de 0,87 (concordancia muy buena entre uT y pT); y de 0,005 para la estadificación N (concordancia pobre). Conclusiones: en nuestra experiencia, la PD de la uTN del cáncer de recto alcanza el 83 y el 72% respectivamente, resultados acordes con lo disponible en la literatura. La uT del cáncer de recto muestra una concordancia muy buena con la pT
Objective: our aim was to evaluate the accuracy of endosonography (EUS) in our experience, to stage rectal cancer. Material and methods: we prospectively included all patients with rectal cancer staged in our unit from September 2002 until February 2006 in a database. We selected those patients who had a complete EUS examination and were surgically treated without neoadjuvant therapy. Once we had the results of the histopathological staging (pTN), which was considered the gold standard, we compared the results of the previous EUS staging (uTN) with those of the pTN. We calculated the sensitivity, specificity, positive predictive value, negative predictive value and accuracy for each T stage, and for N staging considered as N positive or negative. We also calculated the global accuracy for T stage. We also calculated the agreement of uTN with pTN staging using the kappa index for N stage, and quadratic weighted kappa index for T stage. Results: we staged 120 patients with rectal cancer during the mentioned period. Of these, 36 patients met inclusion criteria and were evaluated, 21 women and 15 men. Mean age was 68,53 ± 10,15 yo (range: 48-90). Global T stage accuracy was 83%. N stage accuracy was 72%. We obtained a S, E, PPV, NPV and A of 91, 100, 100, 96 and 97% for T1; 82, 88, 75, 91 and 86% for T2; 86, 91, 86, 91 and 89% for T3; and 14, 86, 20, 80 and 72% for N stage respectively. Kappa value for T stage was 0,87 indicating a very good agreement between uT and pT according to the kappa index criteria. Kappa value for N stage agreement was 0,005; poor according to the same criteria. Conclusions: in our experience, the diagnostic accuracy of EUS for T and N staging of rectal cancer is 83% and 72% respectively, similar results as previously published. uT staging for rectal cancer shows a very good agreement with pT staging
