RESUMEN Introducción: El sinus tympani (ST) es una de las áreas que más presenta colesteatoma residual. Recientemente se ha clasificado en 3 tipos de acuerdo a su morfología. Objetivos: Determinar el tipo de ST en los pacientes sometidos a cirugía de colesteatoma y analizar su impacto como factor de recidiva. Material y método: Revisión de fichas clínicas de pacientes sometidos a cirugía de colesteatoma entre los años 2004 y 2015 en el Hospital Regional de Concepción. Análisis de la tomografía axial computarizada (TAC) preoperatoria y posterior evaluación clínica de los pacientes operados mediante mastoidectomía canal wall down (CWD). Resultados: En el periodo descrito se operaron 271 oídos. El 60% de los casos analizados presentó ST tipo A y 40% ST tipo B. Se identificaron 12 casos de recidiva, 3 ST tipo B y 9 ST tipo A, sin diferencia estadísticamente significativa entre ambos. Discusión: Distinto a lo reportado en la literatura el tipo de ST más frecuente en nuestro estudio fue el tipo A, lo que podría corresponder a una variable étnica. Conclusión: El estudio preoperatorio con TAC es una herramienta útil para evaluar el tipo y compromiso del ST. Las diferencias anatómicas entre ST tipo A y B parece no ser un factor determinante de recidiva en mastoidectomías CWD.
ABSTRACT Introduction: Sinus tympani (ST) is one of the areas with the most residual cholesteatoma. Recently it has been classified in 3 types according to its morphology. Aim: To determine the type of ST in patients undergoing cholesteatoma surgery and to analyze its impact as a relapse factor. Material and method: Review of clinical files of patients submitted to cholesteatoma surgery between 2004 and 2015 at the Regional Hospital of Concepción. Preoperative computed axial tomography (CT) analysis and subsequent clinical evaluation of patients operated by canal wall down mastoidectomy (CWD). Results: In the described period 271 ears were operated. 60% of the cases analyzed had ST type A and 40% ST type B. Twelve cases of relapse were identified, 3 ST type B and 9 ST type A, with no statistically significant difference between the two. Discussion: Unlike to what is reported in the literature, the most common ST type in our study was type A, which could correspond to an ethnic variable. Conclusion: The preoperative study with CT is a useful tool to evaluate the type and commitment of ST. The anatomical differences between ST type A and B seems not to be a determinant factor of relapse in CWD mastoidectomies.
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