Biopsia estereotáxica mamaria: 2 años de experiencia / Directional vacuum-assisted stereotatic breast biopsy: a 2-year experience

Introduction: Directional vacuum-assisted stereotactic breast biopsy (DVAB), represents an excellent method for obtaining pathological diagnosis, being in many cases an alternative to surgery. Objectives: To present our 2-year experience in DVAB at the University of Chile's Clinical Hospital. Materials and methods: a descriptive retrospective study of DVAB was conducted in our Hospital from March 2005 to November 2007. Morphology of lesions, BI-RADS classification, pathology reports, complications as well as epidemiological data were recorded. Results: We included 79 patients with 95 lesions. Mean age 55 years. Of the 95 biopsies, 95.7 percent were microcalcifications. The sensitivity was 92.8 percent and specificity 100 percent. The positive predictive value was 100 percent, while negative PVwas 98.7 percent, with 8 percent of subestimation and complication rate of 3,1 percent. Conclusions: Our results confirm the advantages of said procedure in our Center, proving DVAB as highly reliable, with good histological correlation and minimal complications.

Introducción: La biopsia estereotáxica digital mamaria (BED), representa un excelente método para obtener diagnóstico histológico, siendo alternativa de elección frente a la cirugía en muchos casos. Objetivo: Presentar nuestra experiencia en la aplicación de la BED en el Hospital Clínico de Universidad de Chile. Material y método: Estudio descriptivo, retrospectivo de BED realizadas en el Hospital Clínico de la Universidad de Chile (marzo 2005-noviembre 2007). Se registró morfología de las lesiones, clasificación BI-RADS, informes de anatomía patológica, complicaciones y datos epidemiológicos. Resultados: Se incluyó a 79 pacientes con 95 lesiones. Edad promedio 55 años. De las 95 biopsias, 95,7 por ciento correspondieron a microcalcificaciones. La sensibilidad fue 92,8 por ciento y la especificidad 100 por ciento. El valor predictivo positivo fue 100 por ciento y negativo 98,7 por ciento. La subestimación fue de 8 por ciento y la tasa de complicaciones 3,1 por ciento. Conclusiones: Nuestros resultados confirman las ventajas del procedimiento en nuestro Centro, demostrando la BED como altamente confiable, con buena correlación histológica y mínimas complicaciones.

Linfoma intravascular tratado con anticuerpos monoclonales anti CD20: descripción de un caso clínico / Intravascular lymphoma treated with anti CD20 monoclonal antibodies: report of one case

We report a 78 year old male with prostatism, that was subjected to a prostate biopsy. The pathological study showed a microvascular lymphocytic infiltration. Four months later, the patients presentd with reduced alertness, cough, dyspnea, fever and elevation of lactic dehydrogenase and erythrocyte sedimentation rate. Chest and abdominal CAT scans, bone marrow aspirate, protein electrophoresis and prostate specific antigen were normal. A re-evaluation of prostate biopsy showed an intravascular lymphoid infiltration, positive for CD45 and CD20, compatible with the diagnosis of intravascular lymphoma. Chemotherapy was started, but it was not tolerated by the patient and the response was partial. Therefore, treatment with monoclonal antibodies anti CD20 (Rituximab) was started. The tumor had a complete and prolonged (24 months) remission after the treatment.