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OBJETIVOS: O objetivo deste estudo é determinar a especificidade, sensibilidade e a acurácia da ultra-sonografia (USG) intra-oral e transcutânea no diagnóstico de celulite e abscesso periamigdalianos. FORMA DE ESTUDO: Clínico Prospectivo. MATERIAL E MÉTODO: Trinta e nove pacientes foram atendidos no pronto-socorro de otorrinolaringologia do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo com diagnóstico clínico de celulite ou abscesso periamigdaliano. Em todos os pacientes, após a avaliação inicial, foram realizadas ultra-sonografias intra-oral e transcutânea. RESULTADOS: O USG intra-oral foi realizado em 35 casos e demonstrou sensibilidade de 95,2%, especificidade de 78,5% e a acurácia de 86,9%. A USG transcutânea foi factível em todos os 39 pacientes e diagnosticou abscesso periamigdaliano em 53,8% dos pacientes. A sensibilidade foi de 80%, a especificidade de 92,8% e a acurácia de 84,5%. CONCLUSÕES: O USG intra-oral foi bastante sensível no diagnóstico de abscessos periamigdalianos. O USG transcutâneo obteve especificidade superior ao intra-oral. Porém, quando o USG transcutâneo foi realizado em pacientes com trismo, este diagnosticou todos os abscessos periamigdalianos, já que se tratava de coleções grandes, comuns em pacientes com trismo. Estes exames tiveram acurácia semelhantes. AIMS: The objective of the present study was to determine the specificity, sensitivity and accuracy of intraoral and transcutaneous ultrasound (US) in the diagnosis of peritonsillar cellulitis and abscess. STUDY DESIGN: Clinical-Prospective. MATERIAL AND METHODS: Thirty nine patients were seen at the otorhinolaryngology emergency department of the University Hospital, of the School of Medicine, University of São Paulo, with a clinical diagnosis of peritonsillar cellulitis or abscess. After initial evaluation, all patients were submitted to intraoral and transcutaneous US. RESULTS: Intraoral US was performed on 35 cases and its sensitivity was of 95.2%, the specificity was of 78.5% and the accuracy was of 86.9%. Transcutaneous US was feasible in all 39 patients and diagnosed peritonsillar abscess in 53.8%. There were 5 false-negatives and 1 false-positive result, sensitivity was 80%, specificity was 92.8% and accuracy was 84.5%. CONCLUSION: Intraoral US was quite sensitive in the diagnosis of peritonsillar abscesses when performed by an experienced radiologist. Specificity was higher for transcutaneous US compared to intraoral US. However, when transcutaneous US was performed in patients with trismus, it was able to diagnose all peritonsillar abscesses, since they were large collections which are common in patients with trismus. These exams showed similar accuracy

Ultra-sonografia intra-oral e transcutânea cervical no diagnóstico diferencial de celulite e abscessos periamigdalianos