OBJECTIVE: Video "podcasting" is an Internet-based publication and syndication technology that is defined as the process of capturing, editing, distributing, and downloading audio, video, and general multimedia productions. The expanded capacity for visual components allows radiologists to view still and animated media.

CONCLUSION: These image-viewing characteristics and the ease of widespread delivery are well suited for radiologic education. This article presents detailed information about how to generate and distribute a video podcast using a Macintosh platform.

Keywords: computers - iMovie - multimedia presentations - podcasting - Web-based education programs - video presentations

Objective: To show the histopathological correlation of non palpable injuries, and being suspicious of malignity and shown through mastography in the Hospital General de México, through percutaneous biopsies with 11G cutting thick needle and vacuum through sterotaxy (BACVE).

Material and methods: 80 BACVE of patients, shown through mastography, age ranging between 32 and 71 years old, from January 1st, 2005, to December 31st, 2007, using a GE analogical mastographer with digital vertical stereotaxy and with a Mammotome Biopsy equipment. Findings were micro-calcifications, nodules, asymmetrical densities and destruction distortion; and being classified in the categories BI-RADS 3, 4 and 5.

Results: 80 patients were studied, findings were 38 micro calcifications (47.5%), 37 nodules (46.25%) and an asymmetrical density (1.25%). 66 injuries were benign (82.5%) and 14 malign (17.5%), the age group more affected was younger than 39 years old. The ratio between benignity vs. malignity was of 5.7:1. The more frequent malign subtype was the canalicular carcinoma in situ in seven patients (50%). The most common benign lesion was a fibrocystic condition, found in 39 patients (48.75%).

Conclusions: The BACVE is less expensive and invasive, besides if the diagnosis is a carcinoma, tumor markers may be obtained as well as hormonal receptors that provide a predictive value and a prognosis to plan a specific treatment.

Key words: Non palpable injuries, micro-calcifications, duct carcinoma, Mammotome, and biopsy through stereotaxy.

Biostatistics has become an indispensable tool in all domains of the Health Sciences. Biostatistics is essential for ensuring valid decision making, and knowing the basic principles of biostatistics well will enable us to use this tool correctly. In this article, first biostatistics is defined and then its use and justification are discussed. The aim is to go through all of the steps that should be followed in the entire research process, beginning with specifying the objective of the study, approaching different study designs (cross-sectional, prospective and retrospective longitudinal, clinical trials) and the most commonly used statistical techniques in the Health Sciences, from descriptive statistics necessary to begin any study, to univariate analysis of both qualitative and quantitative variables, to the multivariate analyses most commonly used in our field.

Keywords: biostatistics - health sciences - research