Decoding semiotic minimal genome: a non-genocentric approach.

The search for the minimum information required for an organism to sustain a cellular system network has rendered both the identification of a fixed number of known genes and those genes whose function remains to be identified. The approaches used in such search generally focus their analysis on coding genomic regions, based on the genome to proteic-product perspective. Such approaches leave other fundamental processes aside, mainly those that include higher-level information management. To cope with this limitation, a non-genocentric approach based on genomic sequence analysis using language processing tools and gene ontology may prove an effective strategy for the identification of those fundamental genomic elements for life autonomy. Additionally, this approach will provide us with an integrative analysis of the information value present in all genomic elements, regardless of their coding status.

The calculus of codes - From entropy, complexity, and information to life.

Exploring the core components that define living systems and their operational mechanisms within emerging biological entities is a complex endeavor. In the realm of biological systems literature, the terms matter, energy, information, complexity, and entropy are frequently referenced. However, possessing these concepts alone does not guarantee a comprehensive understanding or the ability to reconstruct the intricate nature of life. This study aims to illuminate the trajectory of these organic attributes, presenting a theoretical framework that delves into the integrated role of these concepts in biology. We assert that Code Biology serves as a pivotal steppingstone for unraveling the mechanisms underlying life. Biological codes (BCs) emerge not only from the interplay of matter and energy but also from Information. Contrary to deriving information from the former elements, we propose that information holds its place as a fundamental physical aspect. Consequently, we propose a continuum perspective called Calculus of Fundamentals involving three fundamentals: Matter, Energy, and Information, to depict the dynamics of BCs. To achieve this, we emphasize the necessity of studying Entropy and Complexity as integral organic descriptors. This perspective also facilitates the introduction of a mathematical theoretical framework that aids in comprehending continuous changes, the driving dynamics of biological fundamentals. We posit that Energy, Matter, and Information constitute the essential building blocks of living systems, and their interactions are governed by Entropy and Complexity analyses, redefined as biological descriptors. This interdisciplinary perspective of Code Biology sheds light on the intricate interplay between the controversial phenomenon of life and advances the idea of constructing a theory rooted in information as an organic fundamental.

Physiological and transcriptome analyses of Kluyveromyces marxianus reveal adaptive traits in stress response.

Kluyveromyces marxianus is a non-conventional yeast with outstanding physiological characteristics and a high potential for lignocellulosic ethanol production. However, achieving high ethanol productivity requires overcoming several biotechnological challenges due to the cellular inhibition caused by the inhibitors present in the medium. In this work, K. marxianus SLP1 was adapted to increase its tolerance to a mix of inhibitory compounds using the adaptive laboratory evolution strategy to study the adaptation and stress response mechanisms used by this non-Saccharomyces yeast. The fermentative and physiological parameters demonstrated that the adapted K. marxianus P8 had a better response against the synergistic effects of multiple inhibitors because it reduced the lag phase from 12 to 4 h, increasing the biomass by 40% and improving the volumetric ethanol productivity 16-fold than the parental K. marxianus SLP1. To reveal the effect of adaptation process in P8, transcriptome analysis was carried out; the result showed that the basal gene expression in P8 changed, suggesting the biological capability of K. marxianus to activate the adaptative prediction mechanism. Similarly, we carried out physiologic and transcriptome analyses to reveal the mechanisms involved in the stress response triggered by furfural, the most potent inhibitor in K. marxianus. Stress response studies demonstrated that P8 had a better physiologic response than SLP1, since key genes related to furfural transformation (ALD4 and ALD6) and stress response (STL1) were upregulated. Our study demonstrates the rapid adaptability of K. marxianus to stressful environments, making this yeast a promising candidate to produce lignocellulosic ethanol. KEY POINTS: • K. marxianus was adapted to increase its tolerance to a mix of inhibitory compounds • The basal gene expression of K. marxianus changed after the adaptation process • Adapted K. marxianus showed a better physiological response to stress by inhibitors • Transcriptome analyses revealed key genes involved in the stress response.

Genotoxicity and Reproductive Risk in Workers Exposed to Pesticides in Rural Areas of Curicó, Chile: A Pilot Study.

Significant risks to human health have been associated with chronic exposure to low doses of pesticides, a situation which may be frequent among agricultural workers. In this context, and regarding the agricultural-based economy of central Chile, we aimed to explore the genotoxic damage in agricultural workers and reproductive risk among women in rural and urban areas of Curicó, a traditional agricultural district in Chile. Hence, we sampled a group of rural agricultural workers associated with pesticide management (n = 30) and an urban unexposed group (n = 30). Our results showed that the agricultural workers had higher micronuclei frequencies (MN: ß = 13.27; 95% CI low = 11.08, CI high = 15.47) and women had a 40-fold higher risk of reproductive problems (OR = 40.32; 95% CI low = 2.60, CI high = 624.31) than the unexposed group. The factor analysis of mixed data (FAMD) showed that neither the sex nor smoking habits appear to define the ordination of the data. Nevertheless, the exposure level did segregate them in the multidimensional space (explained variance: 35.38% dim-1; 18.63% dim-2). This pilot study highlights the higher risks of biological conditions negatively associated with the health of agricultural workers.

Driver interactions lead changes in the distribution of imperiled terrestrial carnivores.

Biodiversity is dramatically declining worldwide due to the complex processes that include interactions among threats. Studies investigating how multiple drivers (inter)act to influence spatio-temporal shifts in species distribution ranges, which are among the most anticipated changes in biodiversity in the future, are still scarce in the scientific literature, particularly at meaningful conservation planning scales. We used species occurrence data for eight terrestrial Mediterranean carnivores at a regional scale of southern Spain to: 1) estimate environmental favourability to each species during two periods (1960s and present); 2) predict current favourability assuming the same environment-species relationships as the ones observed in the 1960s (expected favourability); and 3) analyse single and interactive effects of human persecution, presence of protected areas, and prey richness on favourability changes (present vs. expected) for each carnivore species. We found that, with a few exceptions, environmentally favourable areas for carnivore occurrence were more widely distributed in the past than today and, for most species, favourability tended to increase inside protected areas, with low frequency of poisoning events and high prey richness. Notwithstanding, for rare species such as Iberian grey wolf (Canis lupus signatus) and Iberian lynx (Lynx pardinus), interactions among drivers were the most important predictors of favourability changes, underpinned by a compensatory role of protected areas in the face of continued human persecution. We emphasize the role of protected areas in abating the effects of biodiversity threats and claim that scientific studies based on analyses of single-effect drivers that omit driver interactions may misinform conservation planning and require revision.

Ensayo clínico aleatorizado, doble ciego, controlado con placebo sobre la utilidad del probiótico Lactobacillus reuteri en la terapia de erradicación cuádruple con bismuto de la infección por Helicobacter pylori / Randomized, double-blind, placebo-controlled clinical trial on the usefulness of probiotic Lactobacillus reuteri in bismuth-containing quadruple eradication therapy for infection with Helicobacter pylori

Introducción: el objetivo principal de este estudio fue evaluar la reducción de los síntomas gastrointestinales de pacientes con terapia de erradicación cuádruple con bismuto, complementada con cepas de Lactobacillus reuteri (DSM 17938 y ATCC PTA 6475), frente a un placebo.Materiales y métodos: ensayo clínico aleatorizado, doble ciego, de brazos paralelos y controlado con placebo. Los pacientes recibieron en primera línea el régimen erradicador basado en subcitrato de bismuto potásico, metronidazol, clorhidrato de tetraciclina (cápsulas tres en uno) y omeprazol 40 mg dos veces al día durante diez días, más un comprimido (probiótico o placebo) durante treinta días. En el seguimiento se evaluaron los síntomas gastrointestinales mediante una escala de valoración (GSRS) y los eventos adversos a los 0, 14, 28 y 56 días.Resultados: se incluyeron un total de 80 pacientes desde febrero de 2018 a mayo de 2019 en un solo centro. El tratamiento erradicador fue eficaz en el 85 % de los pacientes, sin diferencias entre los dos brazos de tratamiento. En el grupo que recibió el probiótico, el dolor abdominal se redujo en el 42 % de los pacientes, en comparación con el 19 % del grupo de control (OR: 0,27; IC 95 %: 0,13-0,58; p < 0,001), y la distensión abdominal se redujo un 25 %, frente a un 17 % en el grupo de control (OR: 0,24; IC 95 %: 0,19-0,84; p < 0,001).Conclusiones: el tratamiento con L. reuteri consiguió reducir solo el dolor y la distensión abdominal. Se necesitan más estudios para determinar la contribución de los probióticos como terapia adyuvante en la erradicación de H. pylori. (AU)

Randomized, double-blind, placebo-controlled clinical trial on the usefulness of probiotic Lactobacillus reuteri in bismuth-containing quadruple eradication therapy for infection with Helicobacter pylori.

INTRODUCTION: the primary goal of this study was to compare gastrointestinal symptom reduction in patients on bismuth-containing quadruple eradication therapy supplemented with Lactobacillus reuteri strains (DSM 17938 and ATCC PTA 6475) or placebo. MATERIALS AND METHODS: this was a randomized, double-blind, parallel-arm, placebo-controlled clinical trial. Patients received a first-line eradication regimen based on bismuth subcitrate potassium, metronidazole, tetracycline hydrochloride (three-in-one capsules) and omeprazole 40 mg twice a day for ten days, plus a probiotic or placebo tablet for 30 days. During follow-up, gastrointestinal symptoms were assessed using an evaluation scale (GSRS), and adverse events were collected at 0, 14, 28 and 56 days. RESULTS: a total of 80 patients were included from February 2018 to May 2019 at a single site. Eradication therapy was effective in 85 % of patients, with no differences between treatment arms. In the group receiving the probiotic, abdominal pain decreased in 42 % of patients, compared with 19 % in the control group (OR: 0.27; CI, 0.13-0.58; p < 0.001), and abdominal distension decreased in 25 % versus 17 % in the control group (OR: 0.24; IC, 0.19-0.84; p < 0.001); Conclusions: treatment with L. reuteri only reduced abdominal pain and distension. Further studies are needed to establish the role of probiotics as adjuvant therapy in H. pylori eradication.

Diploid genome assembly of Kluyveromyces marxianus NRRL Y-50883 (SLP1).

The yeast Kluyveromyces marxianus SLP1 has the potential for application in biotechnological processes because it can metabolize several sugars and produce high-value metabolites. K. marxianus SLP1 is a thermotolerant yeast isolated from the mezcal process, and it is tolerant to several cell growth inhibitors such as saponins, furan aldehydes, weak acids, and phenolics compounds. The genomic differences between dairy and nondairy strains related to K. marxianus variability are a focus of research attention, particularly the pathways leading this species toward polyploidy. We report the diploid genome assembly of K. marxianus SLP1 nonlactide strain into 32 contigs to reach a size of ∼12 Mb (N50 = 1.3 Mb) and a ∼39% GC content. Genome size is consistent with the k-mer frequency results. Genome annotation by Funannotate estimated 5000 genes in haplotype A and 4910 in haplotype B. The enriched annotated genes by ontology show differences between alleles in biological processes and cellular component. The analysis of variants related to DMKU3 and between haplotypes shows changes in LAC12 and INU1, which we hypothesize can impact carbon source performance. This report presents the first polyploid K. marxianus strain recovered from nonlactic fermenting medium.

Comparación de secuencias volumétricas con técnicas convencionales en resonancia magnética de columna lumbar / Comparison of volumetric and conventional sequences for the evaluation in magnetic resonance of the lumbar spine

Objetivo: Comparar el protocolo que incluye la secuencia tridimensional SPACE-3D con el protocolo convencional en el estudio imagenológico por resonancia magnética (RM) del paciente con dolor lumbar. Metodología: Se realizó un estudio prospectivo de pruebas diagnósticas, en el que se tomaron imágenes por RM de la columna lumbar de 40 pacientes utilizando un protocolo convencional y otro protocolo que incluyera una secuencia volumétrica (SPACE-3D) en conjunto con secuencia axial con información T1 y sagital STIR, en un resonador de 1,5T. Las imágenes fueron interpretadas por dos radiólogos de manera independiente, empleando tanto el protocolo convencional como el protocolo que incluía la secuencia volumétrica, con un mes de diferencia. Se compararon ambos protocolos calculando la sensibilidad y la especificidad con el intervalo de confianza (IC 95 %), se consideró significación estadística un valor de p≤ 0,05 utilizando la prueba de Chi-cuadrado. Se evaluaron para ambas técnicas variables como presencia o no de artefactos, protrusión/extrusión discal, estrechez del canal neural central, receso lateral o foramen de emergencia radicular, radiculopatía. Se calculó la concordancia inter e intraobservador utilizando el índice Kappa con un IC 95 %. Resultados: Se encontró que el protocolo que incluye la secuencia SPACE-3D presenta rendimiento diagnóstico similar (no inferior) frente al protocolo con las secuencias convencionales para las variables evaluadas; igualmente, se detectaron los hallazgos anormales, lo cual permitió un estudio completo y un diagnóstico en menor tiempo. Conclusiones: El rendimiento diagnóstico del protocolo que incluye la secuencia volumétrica SPACE-3D es similar (no inferior) al protocolo con las secuencias convencionales utilizadas en RM de columna lumbar y acorta el tiempo total del estudio

Objective: To compare the protocol that includes the three-dimensional SPACE-3D sequence with the conventional protocol in the magnetic resonance imaging (MRI) study of patients with low back pain. Methods: A prospective study of diagnostic tests was carried out, in which MR images of the lumbar spine were taken from 40 patients using a conventional protocol and another protocol that included a volumetric sequence (SPACE-3D) in conjunction with axial T1 and sagittal STIR sequences, in a 1.5T resonator. The images were interpreted by two radiologists independently, both the conventional protocol and the protocol that included the volumetric sequence, one month apart. Both protocols were compared, calculating the sensitivity and specificity with the confidence interval (CI 95%), a value of p ≤0.05 using the Chi-square test was considered statistically significant. Variables such as the presence or absence of artifacts, disc protrusion/extrusion, narrowing of the central neural canal, lateral recess or root emergence foramen, and presence of radiculopathy, among others, were evaluated for both techniques. Inter- and intra-observer agreement was calculated using the Kappa index with a 95% CI. Results: it was found that the protocol that included the SPACE-3D sequence presents similar diagnostic performance (not inferior) when compared to the protocol with the conventional sequences for the variables evaluated, similarly, abnormal findings were detected, which allowed a complete study and diagnosis in less time. Conclusions: The diagnostic performance of the protocol that includes the SPACE-3D volumetric sequence is similar (not inferior) to the protocol with conventional sequences used in MRI of the lumbar spine and shortens the total study time.

In Vivo High Plasticity of Multi-Drug Resistant ST258 Klebsiella pneumoniae.

Carbapenemase production in Enterobacterales clinical isolates is a global threat. Multi-drug resistant Klebsiella pneumoniae harboring carbapenemases are a major concern among the hospital settings in Latin America. Aim: The aim of this study was to analyze the genetic relatedness between three isolates of K. pneumoniae recovered from one patient in the same bacteriological round on the same day, which exhibited different susceptibility profiles to carbapenems (CP) and to colistin (Col). Isolates' profiles were as follows (susceptible-S/resistant-R): CPS/ColR, CPR/ColR, and CPR/ColS. Pulse-field gel electrophoresis, multilocus sequence typing, and whole genome sequencing were performed. Conjugation assays were carried out and PCR determination in transconjugants (Tcs) was made for: blaCTX-M-groups, blaNDM, blaKPC, blaTEM, qnr alleles, aac(6')Ib-cr, ermB, and plasmid incompatibility groups (Inc). Results: All isolates belonged to the same clone, to ST258 and harbored blaCTX-M-14, blaCTX-M-15, qnrA1, qnrB1, aac(6')Ib-cr, and wzi154 (capsule-locus KL107). One isolate had additional wzi gene, wzi109 (capsule-locus KL36). In CPR isolates, the pattern was explained for blaNDM-1 or blaNDM-1/blaKPC-2 presence, and in ColR for IS5-like element insertion in mgrB at different positions. Co-mobilization of blaNDM-1/qnrA1 was associated to a different plasmid Inc (A/C-FII) in both blaNDM-1 donors. Mobilization of blaCTX-M-14 was related to IncI1 in one donor. Conclusion: These findings highlight the potential plasticity of ST258 K. pneumoniae clone. To the best of our knowledge, this is the first description of blaNDM-1/blaKPC-2-producing K. pneumoniae ST258 in Latin America.

Asociación inusual: síndrome del ligamento arcuato y síndrome del cascanueces / An unusual association: median arcuate ligament syndrome and nutcracker syndrome

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An unusual association: median arcuate ligament syndrome and nutcracker syndrome.

We present a case of arcuate ligament syndrome diagnosed in a 23-year-old patient with epigastric pain, vomiting and weight loss, using Doppler ultrasound and CT-angiography, treated by surgical resection of the ligament with complete resolution of symptoms. In addition, incidentally the patient was diagnosed with a nutcracker syndrome, without clinical repercussions.

[Written tests analysis under the principles of authentic assessment. A comparative study of written tests of medical and other undergraduate programs]. / Análisis de pruebas escritas bajo los principios de la evaluación auténtica. Estudio comparativo entre carreras de la salud y otras carreras de dos universidades de la Región del Biobío.

BACKGROUND: Learning assessment has great impact in students' achievement. However, it is one of the least intervened and researched areas in higher education institutions, all over the world. AIM: To compare the written tests applied to students of three health science undergraduate programs (Speech Therapy, Medical Technology and Nursing), with the written tests of three programs of other areas (Business and Administration, Psychology and Bioengineering). MATERIAL AND METHODS: Comparisons were done using the Authentic Assessment Model's indicators. Also, the magnitude of the change in these variables was evaluated in these two groups of undergraduate programs, after the participation of the teachers in a training program based on this model. A quantitative and repeated measurements design was used. Nineteen teachers participated (nine from medical sciences and 10 from other areas), who drafted 88 written tests before the intervention (which involved 1,318 items) and 93 written tests (that grouped 1,051 items) after it. Items were analyzed using a Hierarchical Lineal Model (HLM), controlling the tests' and the teachers' effects. RESULTS: Both groups of undergraduate programs use multiple choice items with a higher frequency, although there were differences in the rest of the items. Also, HLM analysis showed that these programs differed in their changes after the intervention. Health science programs had less improvement in changing the kind of items used, but improved more in Authentic Assessment indicators. CONCLUSIONS: Written tests improved after an intervention aiming to improve the teachers' skills to prepare such tests.

Análisis de pruebas escritas bajo los principios de la evaluación auténtica: estudio comparativo entre carreras de la salud y otras carreras de dos universidades de la Región del Biobío / Written tests analysis under the principles of authentic assessment: a comparative study of written tests of medical and other undergraduate programs

Background: Learning assessment has great impact in students' achievement. However, it is one of the least intervened and researched areas in higher education institutions, all over the world. Aim: To compare the written tests applied to students of three health science undergraduate programs (Speech Therapy, Medical Technology and Nursing), with the written tests of three programs of other areas (Business and Administration, Psychology and Bioengineering). Material and Methods: Comparisons were done using the Authentic Assessment Model's indicators. Also, the magnitude of the change in these variables was evaluated in these two groups of undergraduate programs, after the participation of the teachers in a training program based on this model. A quantitative and repeated measurements design was used. Nineteen teachers participated (nine from medical sciences and 10 from other areas), who drafted 88 written tests before the intervention (which involved 1,318 items) and 93 written tests (that grouped 1,051 items) after it. Items were analyzed using a Hierarchical Lineal Model (HLM), controlling the tests' and the teachers' effects. Results: Both groups of undergraduate programs use multiple choice items with a higher frequency, although there were differences in the rest of the items. Also, HLM analysis showed that these programs differed in their changes after the intervention. Health science programs had less improvement in changing the kind of items used, but improved more in Authentic Assessment indicators. Conclusions: Written tests improved after an intervention aiming to improve the teachers' skills to prepare such tests.

Neumatosis intestinal: ¿una urgencia abdominal? / Cystic pneumatosis intestinalis: an emergency?

Resumen El auge de las imágenes diagnósticas, en especial de la tomografía computarizada multidetector ha permitido que entidades poco conocidas sean detectadas con relativa frecuencia. Inicialmente, se creía que todos los pacientes con neumatosis intestinal padecían enfermedades abdominales graves o presentaban complicaciones que requerían un manejo quirúrgico inmediato, pero al conocer mejor esta entidad, en parte gracias al aumento en el número de tomografías realizadas en la práctica diaria, se ha demostrado que la neumatosis intestinal también puede presentarse en pacientes asintomáticos o asociada a entidades benignas. Es importante conocer los signos y síntomas que ayudan a diferenciar las formas benignas de neumatosis de aquellas que ponen en peligro la vida del paciente y requieren manejo quirúrgico. Presentamos dos casos de neumatosis intestinal y una revisión de la literatura que ayudarán a aclarar la presentación por imágenes y etiología de esta entidad poco conocida.

Abstract Penumatosis intestinalis is a clinical condition that has been increasingly detected in recent years with the escalating use of computed tomography for abdominal imaging. Previously, it was thought that all the patients cursing with penumatosis intestinalis had life threatening conditions that required immediate surgical treatment. With the increased detection of this radiologic entity, benign causes have been described for example the cystic pneumatosis intestinalis, which in the mayority of times is an isolated finding and does not require surgery. It is important to recognize the signs and symptoms that help differentiate the benign forms, from those that are life-threatening conditions and require surgery. We report two cases of pneumatosis cystoides and a review of the literature that will illustrate the imaging findings and etiology of this rare entity.

Fetal Magnetic Resonance Imaging Findings in Prenatal Zika Virus Infection.

Brain lesions and malformations have been described on ultrasonography of prenatal Zika infection; however, there are scarce reports about fetal magnetic resonance (MR) findings. We report 3 cases of fetuses with confirmed intrauterine Zika virus infection evaluated by ultrasound and fetal MR. Various morphometric measurements were assessed and brain maturation was calculated with the fetal total maturation score. Fetuses with prenatal Zika virus infection showed retardation in brain maturation indexes evaluated by fetal MR. Brain calcifications were demonstrated by neurosonography in all cases, while fetal MR characterized the specific type of cortical development malformation.

Fístula esofágica por tuberculosis en pacientes con VIH: Presentación de dos casos / Tuberculosis Esophageal Fistula in HIV Patients: Report of Two Cases

En los pacientes con VIH es frecuente la tuberculosis (TB) extrapulmonar; sin embargo, la incidencia de afectación esofágica es baja. Se requiere de una alta sospecha clínica para realizar un adecuado enfoque diagnóstico y para identificar al Mycobacterium TB como agente causal de infección. Los estudios por imagen, como la radiografía convencional de tórax, el esófagograma, la tomografía computarizada multicorte (TCM) y la endoscopia digestiva superior aportan información basada en hallazgos específicos que pueden orientar hacia el diagnóstico de TB ganglionar y esofágica. Sirven como guía para la toma de muestras de tejidos y la realización de estudios confirmatorios de presencia del bacilo, como las pruebas moleculares y cultivos. Se reseñan 2 casos de pacientes jóvenes, de sexo masculino, con diagnóstico de VIH/sida C3 con coinfección por TB, quienes desarrollaron compromiso ganglionar mediastinal y esofágico, con perforación secundaria y fístula mediastínica.

Extrapulmonary tuberculosis (TB) is frequent in HIV patients; nevertheless, the incidence of esophageal involvement is low and high clinical suspicion is required for a proper diagnostic approach in order to identify Mycobacterium TB as a causative agent of infection. Imaging studies such as conventional chest radiography, esophagogram, multislice computed tomography (MCT), and upper endoscopy provide information based on specific findings that can lead to the diagnosis of TB. They serve as a guide for tissue sampling and confirmatory molecular tests and cultures. This article presents two cases of young male patients diagnosed with HIV/AIDS C3 and co-infected with TB, who developed esophageal and mediastinal lymph node involvement, with secondary perforation and mediastinal fistula.

Aproximación diagnóstica de las fístulas perianales por resonancia magnética / Diagnostic Approach to Perianal Fistulas with Magnetic Resonance

La enfermedad fistulosa perianal es una entidad inflamatoria crónica que afecta el canal anal y los espacios perianales. Las fístulas anales presentan gran morbilidad y recurrencia. Para definir el tipo de tratamiento quirúrgico o médico, evitar recurrencias y complicaciones como la incontinencia fecal, es importante una adecuada caracterización y clasificación de las fístulas mediante la resonancia magnética (RM). Actualmente la RM es el estudio imaginológico con mayor sensibilidad diagnóstica debido a su alta resolución anatómica para definir las estructuras del canal anal y demostrar el trayecto fistuloso con sus complicaciones (abscesos y trayectos secundarios).

Fistulous perianal disease is an inflammatory entity that affects the anal canal and perianal spaces. Anal fistulas represent important morbidity and recurrence for patients. For the planning of surgical treatment, preventing recurrences and complications like fecal incontinence, a proper characterization and classification of fistulas with magnetic resonance must be done. Currently, magnetic resonance is the imaging modality with greatest diagnostic sensitivity due to its high anatomical resolution in defining structures like the anal canal and fistulous tracts with its complications (abscesses, secondary paths).

Angiosarcoma de la mama: Presentación de dos casos / Angiosarcoma of the Breast: Report of Two Cases

Los angiosarcomas de la mama son tumores raros que conforman menos del 1 % de las neoplasias mamarias. Estos tumores pueden desarrollarse de forma primaria o secundaria y se han descrito 219 casos en la literatura mundial desde el primer caso informado por Schmidt en 1887. A continuación se presentan dos casos de angiosarcoma primario de la mama y sus principales características en los diferentes métodos diagnósticos.

Angiosarcomas are rare tumors that make up less than 1% of breast cancers. These tumors may develop in a primary or secondary form, and 219 cases have been reported in the literature since the first case described by Schmidt in 1887. Here we present two cases of primary angiosarcoma of the breast and its main features in different imaging modalities