Repository logo
  • Communities & Collections
  • All of DSpace
  • English
  • Español
  • Português do Brasil
  • Log In
    New user? Click here to register. Have you forgotten your password?
  • English
  • Español
  • Português do Brasil
  • Log In
    New user? Click here to register. Have you forgotten your password?
  1. Home
  2. Browse by Author

Browsing by Author "Pinochet, Miguel"

Now showing 1 - 3 of 3
Results Per Page
Sort Options
  • Loading...
    Thumbnail Image
    Item
    Hamartoma mioide, serie de casos y revisión de la literatura
    (Sociedad Chilena de Radiologia, 2016) Uchida, Marcela; Altamirano, Aleen; Horvath, Eleonora; Pinochet, Miguel; Galleguillos, Maria; Wenzel, Heriberto; Gallegos, Marcela
    Myoid hamartoma is a rare entity, and was first described by Davies and Riddell in 1973. It is pathologically defined as the mixture of fatty glandular tissue and fibrous connective tissue, associated with a widespread focus of fusiform muscle cells. Six cases of HM diagnosed in seven patients are presented, with emphasis on imaging findings and characteristics of their respective core biopsies. The importance of biopsy in these lesions is required to differentiate malignant diseases. There is no need for excisional biopsy, because this is not associated with high-risk lesions or carcinomas.
  • Loading...
    Thumbnail Image
    Item
    Parallel Artery and Vein: Sign of Benign Nature of Breast Masses
    (American Roentgen Ray Society, 2012) Horvath, Eleonora; Silva, Claudio; Fasce, Gerardo; Ferrari, Camilo; Pinochet, Miguel; Galleguillos, Cecilia; Soto, Eduardo
    OBJECTIVE: The purpose of this study was to assess the parallel artery and vein sign at color Doppler breast ultrasound as a predictor of the benign nature of breast masses. SUBJECTS AND METHODS: A prospective study was performed to identify evidence of a parallel artery and vein in breast lesions consecutively biopsied with a 14-gauge needle under ultrasound guidance. Sensitivity, specificity, positive and negative predictive values, likelihood ratios, and 95% CIs for the parallel artery and vein sign were calculated. RESULTS: The parallel artery and vein sign was identified in 142 of the 1074 masses (13.2%). The specificity for benignity was 99.3% (CI 95%, 98.3-100.0%); sensitivity, 17.6% (CI 95%, 15.0-20.3%); positive predictive value, 99.0% (CI 95%, 96.7-100); negative predictive value, 30.0% (CI 95%, 27.0-32.9); positive likelihood ratio, 24.7 (CI 95%, 21.2-28.7); and negative likelihood ratio, 0.83 (CI 95%, 0.80-0.86). Among masses found to have the parallel artery and vein sign, all BI-RADS ultrasound category 3 and 95.1% of BI-RADS 4 lesions were determined to be benign. CONCLUSION: Although the parallel artery and vein sign is an uncommon finding, it has a significant association with benign pathologic results (96.5%) with a positive likelihood ratio of 24.7. The presence of this color Doppler ultrasound finding in breast masses in BI-RADS ultrasound categories 3 and 4 reinforces the benign nature and may allow follow-up rather than biopsy in the care of some patients.
  • Loading...
    Thumbnail Image
    Item
    Resonancia magnética mamaria preoperatoria – la gran polémica
    (2011) Horvath, Eleonora; Galleguillos, María; Malodonado, Paulina; Fernández, Montserrat; Sañudo, Mercedes; Tiscornia, Paula; Bazán, Juan; Silva, Claudio; Pinochet, Miguel; Gálvez, Joceliyn; Soza, Iván; Uchida, Marcela; Wenzel, Heriberto; Soto, Eduardo; González, Paulina; Ríos, Chyla; Durán, María Paz
    El estudio preoperatorio en búsqueda de multifocalidad, multicentricidad y bilateralidad –antes considerada la indicación más sólida de la resonancia magnética (RM) mamaria– hoy se encuentra fuertemente cuestionada en la literatura. En este trabajo nos propusimos evaluar la capacidad de la RM mamaria en nuestro centro para mejorar la etapificación radiológica preoperatoria realizada por métodos convencionales y determinar la proporción de las pacientes en que genera cambio en el enfoque quirúrgico. Hemos revisado retrospectivamente las RM preoperatorias entre enero de 2009 y junio de 2010. Clasificación: Grupo1: la RM no aportó información nueva. Grupo 2: al detectar lesiones adicionales, mejoró la etapificación radiológica, sin cambiar el tipo de la cirugía planificada. Grupo3: demostró nuevas lesiones no malignas y causó cirugía inútil. Grupo 4: cambió correctamente el tipo de cirugía planeada en base a los estudios convencionales. En los 18 meses se realizaron 419 RM mamarias, el 39% de ellas en preoperatorio. Para el análisis se han reclutado 128 pacientes con la siguiente distribución en los grupos predeterminados: Grupo 1 (66%), Grupo 2 (20%), Grupo 3 (2%) y Grupo 4 (12%). En el 95,3% de las pacientes se logró realizar una sola cirugía con márgenes libres. Este trabajo demostró la utilidad de la RM preoperatoria en nuestra práctica: permite una mejor etapificación radiológica en el tercio de las pacientes e incluso cambia correctamente el enfoque quirúrgico en el 12% de los casos.

Santiago

Av. La Plaza Nº 680, Las Condes

Concepción

Ainavillo Nº 456, Concepción

Logo Universidad del Desarrollo

Implementado por OpenGeek Services