ABSTRACT
Las Leucemias y linfomas constituyen las enfermedades oncológicas más frecuentes en pediatría y las bacteriemias representan infecciones graves en estos pacientes. Objetivos: describir los microorganismos aislados de sangre en pacientes con leucemia aguda o linfoma pediátrico; comparar la incidencia de aislamientos según enfermedad de base; detallar las variaciones en la incidencia de dichos aislamientos y la evolución de su resistencia antimicrobiana. Estudio retrospectivo, observacional. Se incluyeron 823 episodios de bacteriemia en 467 pacientes pediátricos, entre julio-2016 y junio-2022, dividido en tres períodos (período-1: años 2016- 2018, período-2: años 2018-2020, período-3: años 2020-2022). Se aislaron 880 microorganismos: 55,3% gram negativos (GN), 40% gram positivos (GP) y 4,7% levaduras. En GN predominaron: enterobacterias (72%) y en GP: estreptococos del grupo viridans (SGV) (34,1%). Se encontró asociación entre LLA-enterobacterias (p=0,009) y LMA-SGV (p<0,001). Hubo aumento de GN entre los períodos 1 y 3 (p=0,02) y 2 y 3 (p=0,002) y disminución de GP entre 2 y 3 (p=0,01). Se registraron los siguientes mecanismos de resistencia: BLEE (16,4%), carbapenemasas: KPC (2,5%); MBL (2,7%) y OXA (0,2%); meticilinorresistencia en Staphylococcus aureus (20%) y estafilococos coagulasa negativos (95%), vancomicina resistencia en Enterococcus spp. (39%), SGV no sensibles a penicilina (44%) y a cefotaxima (13%). Hubo aumento de MBL entre los períodos 1 y 2 (p=0,02) y una tendencia en disminución de sensibilidad a penicilina en SGV entre el 1 y 3 (p=0,058). El conocimiento dinámico y análisis de estos datos es esencial para generar estadísticas a nivel local, fundamentales para el diseño de guías de tratamientos empíricos (AU)
Leukemias and lymphomas are the most common cancers in children and bacteremia is a severe infection in these patients. Objectives: to describe the microorganisms isolated from blood in pediatric patients with acute leukemia or lymphoma; to compare the incidence of isolates according to the underlying disease; and to detail the variations in the incidence of these isolates and the evolution of their antimicrobial resistance. Retrospective, observational study. We included 823 episodes of bacteremia in 467 pediatric patients seen between July-2016 and June-2022, divided into three periods (period-1: 2016- 2018, period-2: 2018-2020, period-3: 2020-2022). A total of 880 microorganisms were isolated: 55.3% were gram-negative (GN), 40% gram-positive (GP) and 4.7% yeasts. In GN there was a predominance of: enterobacteria (72%) and in GP viridans group streptococci (VGS) (34.1%). An association was found between ALL-enterobacteria (p=0.009) and AML-VGS (p<0.001). There was an increase in GN between periods 1 and 3 (p=0.02) and 2 and 3 (p=0.002) and a decrease in GP between 2 and 3 (p=0.01). The following resistance mechanisms were recorded: BLEE (16.4%), carbapenemases: KPC (2.5%), MBL (2.7%), and OXA (0.2%); methicillin resistance in Staphylococcus aureus (20%) and coagulase negative staphylococci (95%), vancomycin resistance in Enterococcus spp. (39%), VGS resistant to penicillin (44%) and to cefotaxime (13%). There was an increase in MBL between periods 1 and 2 (p=0.02) and a decreasing trend in penicillin sensitivity in VGS between periods 1 and 3 (p=0.058). Dynamic knowledge and analysis of these data is essential to generate statistics at the local level, which is fundamental for the design of empirical treatment guidelines (AU)
Subject(s)
Humans , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Leukemia, Myeloid, Acute/complications , Leukemia, Lymphoid/complications , Follow-Up Studies , Bacteremia/microbiology , Febrile Neutropenia/etiology , Lymphoma/complications , Acute Disease , Retrospective Studies , Cohort Studies , Drug Resistance, Bacterial , Anti-Infective Agents/adverse effectsABSTRACT
More than 90% of the population is infected by Epstein-Barr virus (EBV), which has sophisticatedly evolved to survive silently in B cells for the life of infected individuals. However, if the virus-host balance is disturbed, latent EBV infection could be associated with several lymphomas. The age at primary infection varies substantially worldwide, and exposure to EBV is likely to be due to socioeconomic factors. In Argentina, EBV infection is mostly subclinical and 90% of patients are seropositive by the age of 3 years; therefore, its epidemiological characteristics resemble those of an underdeveloped or developing population. EBV-positive Hodgkin lymphoma (HL) in young adults from developed populations has been attributed to delayed primary EBV infection as suggested by the association with recent mononucleosis development. EBV-associated Burkitt lymphoma and Hodgkin lymphoma in children from Argentina display frequencies similar to those observed in developed countries, whereas EBV presence in pediatric diffuse large B-cell lymphoma is slightly increased compared to those populations. However, EBV presence is statistically associated particularly with patients < 10 years of age in all three entities. Therefore, a relationship between low age of EBV seroconversion and B-cell lymphoma development risk could be suggested in children from Argentina.
Más del 90% de la población se encuentra infectada con el virus de Epstein-Barr (VEB), que ha evolucionado sofisticadamente para sobrevivir de por vida de manera silenciosa en las células B de individuos infectados. Sin embargo, si el balance entre el virus y el huésped se altera, la infección latente por VEB se podría asociar con linfomas severos. La edad de la infección primaria varía sustancialmente a escala global, y la exposición al VEB al parecer se relaciona con factores socioeconómicos. En Argentina, la infección por VEB es mayormente subclínica, y el 90% de los pacientes son seropositivos a la edad de 3 años. Por lo tanto, las características epidemiológicas se asemejan a aquellas de una población subdesarrollada o en vías de desarrollo. El linfoma de Hodgkin (LH) positivo para VEB en adultos jóvenes se ha atribuido a una infección por VEB tardía en economías desarrolladas, como lo sugiere la asociación con el desarrollo de mononucleosis. En Argentina, el linfoma de Burkitt y el linfoma de Hodgkin asociados con VEB en niños presentan frecuencias similares a las observadas en países desarrollados, mientras que la presencia de VEB en el linfoma difuso de células B pediátrico se encuentra con un ligero aumento comparado con estas poblaciones. Sin embargo, la presencia de VEB en los tres padecimientos se asocia estadísticamente, en particular, con pacientes menores de 10 años. Por ello, se podría sugerir una la relación entre la menor edad de seroconversión y el riesgo de desarrollo de linfoma de células B en niños de Argentina.
ABSTRACT
Primary caecal lymphoma or the colonic lymphoma is a rare tumor of the gastrointestinal (GIT) tract and comprises only 0.2-1.2% of all colonic malignancies, both in adults and pediatric age group. The most common variety of colonic or caecal lymphoma is a on-Hodgkin’s Lymphoma (NHL) which arises from the lymphoid elements of the intestine. GIT is the most frequently involved site, accounting for 50-60% of all extra nodal lymphomas, and most of them are NHL. In adults, the stomach is the most common location of GIT lymphomas, followed by the small intestine, but the most common GI site of NHL in children is the terminal ileum and the ileo-caecal region. Diagnosis is difficult since lymphoma presents with vague abdominal pain with loss of weight and appetite. It may present as lump abdomen with complications such as intestinal obstruction, bleeding, perforation and peritonitis and intussusseption. Histologically it is B or T cell type with small or large cell variation, but frequently encountered is diffuse large B-cell cell lymphoma (DLBCL). DLBCL has low incidence but favorable outcome in young adults, lesions localized to one area or organ and children below 5 years of age, but has an aggressive course in children between 10-15 years of age and also in adults above 55 years of age. DLBCL or GIT Lymphomas in general have male preponderance. We present a rare case of caecal lymphoma (DLBCL) involving appendix and right ovary in a 12 year old girl who presented with vague symptoms of abdominal pain and abdominal mass. Clinically and radiologically, provisional diagnosis of Ileo-caecal tuberculosis with possibility of adhesions leading to a mass lesion was considered. Histopaththological examination (HPE) revealed the diagnosis and prognosis of the case.
ABSTRACT
Lymphoma is a common cancer of childhood. Its pathologic subtype of anaplastic large cell Non-Hodgkins Lymphoma (NHL) is rare and spread to the central nervous system (CNS) is even rarer. We present here such a case who presented to us with an acute history of fever and diplopia and co-existent polyarthritis since 8 years diagnosed as NHL with CNS involvement. CNS involvement is a rare presenting manifestation of NHL and is an important cause of morbidity and mortality in these patients. Chronic arthritis could be a risk factor or manifestation of immunodeficiency or immune dysregulation when associated with lymphoma. It is important to suspect NHL in children presenting with these symptoms for prompt evaluation and better clinical outcome.
ABSTRACT
BACKGROUND: The Hematopathology Study Group of the Korean Society of Pathologists conducted a nation-wide retrospective analysis of Korean pediatric lymphoma, to provide pathologic data on pediatric/adolescent lymphoma subtypes and features. METHODS: All lymphoma cases of all age groups were collected during a recent 2 year-period (2005-2006) from 32 institutes in Korea. Among 3,686 lymphoma patients, 142 who were age 18 or less were classified according to the World Health Organization (WHO) classification. RESULTS: Among 142 pediatric/adolescent lymphoma patients, Hodgkin lymphoma accounted for 21 (14.8%) and non-Hodgkin lymphoma (NHL) for 121 (85.2%). Hodgkin lymphoma appears to be more common in the pediatric/adolescent age group than in the all-ages group (14.8% vs 4.4%). T- and natural killer cell-NHL was more common in the pediatric/adolescent age group than in the all ages group (46.3% vs 22%). The majority of Korean pediatric/adolescent NHL cases was composed of Burkitt lymphoma, T- or B-lymphoblastic lymphoma, anaplastic large-cell lymphoma, and diffuse large B-cell lymphoma. For lymphoma patients under the age of 6 years, most had B-lymphoblastic or Burkitt lymphoma, which commonly presented at extranodal sites. CONCLUSIONS: The distribution of lymphoma subtypes in the pediatric/adolescent age group is quite different from the distribution of adults, but it was quite similar to distribution in Western countries.