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Neste trabalho procura-se estabelecer o valor da ultra-sonografia no diagnóstico de apendicite, com transdutor multifreqüencial de 5 a 10 MHz. Foi realizado estudo transversal de casos consecutivos de 240 pacientes, de abril de 1996 a setembro de 1998, com suspeita de apendicite. Os critérios ecográficos de apendicite foram apêndice não-compressível e com espessura acima de 6,0 mm, com ou sem apendicólito e/ou coleção. O padrão ouro utilizado foram achados cirúrgicos e acompanhamento clínico durante um ano. A prevalência de apendicite foi de 59%. A ultra-sonografia mostrou sensibilidade de 90%, especificidade de 97%, acurácia de 93%, valor preditivo positivo de 98% e valor preditivo negativo de 87%, tendo ocorrido 2,4% de falso-positivos e 13% de falso-negativos. O ultra-som com transdutor multifreqüencial de 5 a 10 MHz mostra-se um método muito eficaz no diagnóstico de apendicite. The aim of the present study was to establish the diagnostic value of abdominal ultrasonography in the diagnosis of appendicitis using 5--10 MHz multifrequency transducers. A transversal study of 240 consecutive patients examined from April 1996 to September 1998 due to suspected acute appendicitis was conducted. The ultrasonography criteria for acute appendicitis were noncompressible appendix with thickness above 6.0 mm, with or without apendicolith and/or collection. The adopted gold standard were surgical findings and clinical follow-up during one year. The prevalence of appendicitis was 59%. Abdominal ultrasound showed: sensitivity = 90%, specificity = 97%, accuracy = 93%, predictive positive value = 98%, predictive negative value = 87%, false positive = 2% and false negative = 13%. Ultrasonography using 5--10 MHz multifrequency transducers showed to be a very effective imaging diagnosis method for acute appendicitis

Valor da ultra-sonografia abdominal com transdutor multifreqüencial de 5 a 10 mhz no diagnóstico de apendicite