Comparative metabolomics reveals how the severity of predation by the invasive insect Cydalima perspectalis modulates the metabolism re-orchestration of native Buxus sempervirens.

The recent biological invasion of box tree moth Cydalima perspectalis on Buxus trees has a major impact on European boxwood stands through severe defoliation. This can hinder further regrowth and threaten survival of populations. In a mesocosm approach and controlled larval density over a 2-month period, responses of B. sempervirens essential and specialized metabolites were characterized using metabolomics, combining 1H-NMR and LC-MS/MS approaches. This is the first metabolome depiction of major Buxus responses to boxwood moth invasion. Under severe predation, remaining green leaves accumulate free amino acids (with the noticeable exception of proline). The leaf trans-4-hydroxystachydrine and stachydrine reached 10-13% and 2-3% (DW), while root content was lower but also modulated by predation level. Larval predation promoted triterpenoid and (steroidal) alkaloid synthesis and diversification, while flavonoids did not seem to have a relevant role in Buxus resistance. Our results reveal the concomitant responses of central and specialized metabolism, in relation to severity of predation. They also confirm the potential of metabolic profiling using 1H-NMR and LC-MS to detect re-orchestration of metabolism of native boxwood after severe herbivorous predation by the invasive box-tree moth, and thus their relevance for plant-insect relationships and ecometabolomics.

The diary in the intensive care unit: Concept analysis.

INTRODUCTION: Admission to an intensive care unit can cause sequelae to both patients and family members. In some countries, the use of diaries is a preventive action. AIM: This research proposes to critically examine the concept of 'Intensive Care Unit Diary' by analysing the current state of the scientific literature to develop a precise conception of this phenomenon in nursing practice, since there are multiple unknowns regarding its use and content. METHOD: A bibliographic search was carried out in the PubMed, Cochrane Library, Scopus and CINAHL databases in January 2023. The terms used to search for their use and definitions in the databases included Nurse, Concept analysis, Family, Uci Diary, Patient Critical, Intensive Care Unit. We use Wilson's concept analysis, later developed by Walker and Avant. RESULTS: The concept analysis shows that the 'ICU Diary' is a record made in colloquial language by health workers and relatives of the patient admitted to the intensive care unit. Aimed at the patient, with an empathic and reflective style, which offers a narrative of the process, daily life and the conduct or behaviour of the patient during his stay. It is a therapeutic tool led by nurses accepted by patients, families and professionals. Its use benefits the recovery process, reducing post-traumatic stress in family members and patients. It favours communication and the bond between nurses, family members and patients, helping to express feelings and emotions. CONCLUSIONS: The concept of 'UCI Diary' is complex. Through Wilson's model, a clarification of the concept has been achieved, creating a starting point for more precise research on this phenomenon and its effects on patients, family members, professionals and the health system.

Analysis of experimental spectra of phosphine in the Tetradecad range near 2.3 µm using ab initio calculations.

Due to its major interest for the chemistry of planetary atmospheres and exobiology, accurate spectroscopy data of phosphine are required for the search of signatures of this molecule in astronomical observations. In this work, high resolution infrared laboratory spectra of phosphine were analyzed for the first time in the full Tetradecad region (3769-4763 cm-1) involving 26 rotationally resolved bands. Overall, 3242 lines were assigned in spectra previously recorded by Fourier transform spectroscopy at temperatures 200 K and 296 K, using a combined theoretical model based on ab initio calculations. The total nuclear motion Hamiltonian of PH3 including ab initio potential energy surface, was reduced to an effective Hamiltonian using the high-order contact transformation method adapted to vibrational polyads of the AB3 symmetric top molecules, followed by empirical optimization of the parameters. At this step, the experimental line positions were reproduced with a standard deviation of 0.0026 cm-1 that provided unambiguous identification of observed transitions. The effective dipole transition moments of the bands were obtained by fitting to the intensities obtained from variational calculations using the ab initio dipole moment surface. The assigned lines were used to newly determine 1609 experimental vibration-rotational levels up to Jmax = 18 with energy in the range 3896-6037 cm-1 that represents significant extension towards higher energies compared to previous works. Transitions for all 26 sublevels of the Tetradecad were identified but with noticeably fewer transitions for fourfold excited bands because of their weaker intensity. At the final step, pressure-broadened half widths were attached to each transition and a composite line list adopting ab initio intensities and empirical line positions corrected to the accuracy of about 0.001 cm-1 for strong and medium transitions was validated against experimental spectra available in the literature.

Use of a Harmonic scalpel for laparoscopic adrenalectomy in two cats.

Case series summary: Adrenal tumors are rare in cats and reports of laparoscopic adrenalectomy in cats are limited. This case series describes two cats that underwent laparoscopic adrenalectomy using a Harmonic scalpel for dissection and coagulation. Both surgeries were successful, with minimal hemorrhage, smoke production and lateral thermal damage. Vessels were appropriately sealed and surgical times were appropriate. Both cats recovered without complications postoperatively. Relevance and novel information: To our knowledge, this is the first veterinary report to describe the use of the Harmonic scalpel for laparoscopic adrenalectomy as the sole device in cats. Owing to the absence of hemorrhage, there was no indication for irrigation, suction or hemostatics. The Harmonic scalpel is an ultrasonic vessel-sealing device with benefits over conventional electrosurgery, including less lateral thermal damage, less smoke production and improved safety due to the lack of an electrical current. This case report aims to highlight the usefulness of ultrasonic vessel-sealing devices for laparoscopic adrenalectomy in cats.

Tuning the carrier injection barrier of hybrid metal-organic interfaces on rare earth-gold surface compounds.

Magnetic hybrid metal-organic interfaces possess a great potential in areas such as organic spintronics and quantum information processing. However, tuning their carrier injection barriers on-demand is fundamental for the implementation in technological devices. We have prepared hybrid metal-organic interfaces by the adsorption of copper phthalocyanine CuPc on REAu2 surfaces (RE = Gd, Ho and Yb) and studied their growth, electrostatics and electronic structure. CuPc exhibits a long-range commensurability and a vacuum level pinning of the molecular energy levels. We observe a significant effect of the RE valence of the substrate on the carrier injection barrier of the hybrid metal-organic interface. CuPc adsorbed on trivalent RE-based surfaces (HoAu2 and GdAu2) exhibits molecular level energies that may allow injection carriers significantly closer to an ambipolar injection behavior than in the divalent case (YbAu2).

[Translated article] Tarsal coalitions as a cause of pain in the foot of children: Therapeutic options.

BACKGROUND AND OBJECTIVE: The tarsal coalition can be a cause of mid-hindfoot pain in older children. The objective is to analyse the types of coalition treated in our hospital from 2010 to 2019 as well as the treatment carried out. MATERIAL AND METHOD: Observational, descriptive and retrospective study of 18 patients with tarsal coalition, 8 women and 10 men, aged 11.9±2.6 years. Epidemiological data, clinical findings and imaging tests, and treatment performed were collected. RESULTS: Twenty-five feet (38.8% bilateral) were reviewed. The main symptom was pain. Sixty-four percent were associated with flat-valgus foot. Fifty-two percent were located in the calcaneal-scaphoid joint, and 40% in the calcaneal-talar joint. Treatment was conservative in 44.4% of cases and surgical in 56% (coalition resection). There was only one case of recurrence. The results were mostly excellent or good (88%) after a mean follow-up period of 4 years. CONCLUSIONS: The most frequently diagnosed type of tarsal coalition was that located in the calcaneal-scaphoid joint followed by the calcaneal-talar joint, but they can appear in any joint of the foot. Almost half responded well to conservative treatment with mostly good results, but the rest required surgical treatment due to persistence of the symptoms, the results of which were excellent in all cases except one who suffered a recurrence. In cases of calcaneal-talar coalitions associated with severe hindfoot valgus, correction of this deformity, associated or not with resection of the coalition, is recommended.

Glucose consumption and gene expression in granulosa cells collected before and after in vitro oocyte maturation in the southern white rhinoceros (Ceratotherium simum simum).

CONTEXT: With two northern white rhinos (NWR) remaining, the continued existence of this species relies on studying their relative, the southern white rhino (SWR). AIMS: (1) Characterise gene expression in granulosa cells (GC) from SWR cumulus oocyte complexes (COCs) prior to (Pre-) and after (Post-) in vitro maturation (IVM), comparing culture media and oocytes from donors treated with or without gonadotropin stimulation prior to ovum recovery; and (2) evaluate COC glucose consumption in spent media. METHODS: COCs were retrieved from four SWRs. Granulosa cells were collected before and after IVM in SDZ or IZW medium. Total RNA was evaluated by qPCR. KEY RESULTS: Oocyte maturation was greater in SDZ than IZW media. Expression of genes associated with follicle development increased in Pre-IVM GC. Six genes were differentially expressed in Post-IVM GC from stimulated compared to unstimulated donors. COCs from stimulated animals consumed more glucose. Fifty seven percent of oocytes in SDZ medium consumed all available glucose. CONCLUSIONS: Gene expression changed upon in vitro maturation and gonadotropin stimulation. Higher glucose availability might be needed during IVM. IMPLICATIONS: This is the first study examining GC gene expression and COC metabolic requirements in rhinoceros, which are critical aspects to optimise IVM of rhinoceros oocytes.

Lumbar paravertebral tumor in a newborn: congenital lipomatous nevus. / Tumoración paravertebral lumbar en el recién nacido: nevus lipomatoso congénito.

INTRODUCTION: Skin lesions in close proximity to the lumbosacral region should be assessed in newborns, since they may be the first sign of hidden spinal dysraphism. CLINICAL CASE: We present the case of a newborn without significant prenatal history. On the first day of life, a 1 cm diameter nodular lesion was found at the lumbar level of the right paravertebral region, with a vascular stain surrounding the base of the lesion. Neurological examination was normal. A soft tissue ultrasonography was carried out. It showed no continuity with the lumbar spinal canal. As a result of the lesion increasingly growing, resection was decided upon six months later. Pathological examination confirmed diagnosis - Hoffmann-Zurhelle nevus. DISCUSSION: Hoffmann-Zurhelle nevus is an infrequent cutaneous hamartomatous lesion in newborns. Treatment is always surgical in order to avoid potential growth-related complications.

INTRODUCCION: Las lesiones en la piel de los recién nacidos situadas en la proximidad de la región lumbosacra deben estudiarse, ya que, en ocasiones son la primera manifestación de un disrafismo espinal oculto. CASO CLINICO: Recién nacido sin antecedentes prenatales de interés. En su primer día de vida se observa una lesión nodular de un centímetro de diámetro situada en la región paravertebral derecha a nivel lumbar con una mancha vascular envolviendo la base de la lesión. Examen neurológico normal. Se realiza una ecografía de partes blandas donde no se evidencia continuidad con el canal medular lumbar. Seis meses más tarde debido al crecimiento progresivo de la lesión se decide su resección. La anatomía patológica confirma su diagnóstico: nevus de Hoffmann-Zurhelle. COMENTARIOS: El nevus de Hoffmann-Zurhelle es una lesión cutánea hamartomatosa infrecuente en los recién nacidos. El tratamiento es siempre quirúrgico para evitar posibles complicaciones relacionadas con su crecimiento.

Tarsal coalitions as a cause of pain in the foot of children: Therapeutic options. / Las coaliciones tarsianas como causa de dolor en el pie infantil: opciones terapéuticas.

BACKGROUND AND OBJECTIVE: The tarsal coalition can be a cause of mid-hindfoot pain in older children. The objective is to analyze the types of coalition treated in our hospital from 2010 to 2019 as well as the treatment carried out. MATERIAL AND METHOD: Observational, descriptive and retrospective study of 18 patients with tarsal coalition, 8 women and 10 men, aged 11.9±2.6 years. Epidemiological data, clinical findings and imaging tests, and treatment performed were collected. RESULTS: Twenty-five feet (38.8% bilateral) were reviewed. The main symptom was pain. Sixty-four percent were associated with flat-valgus foot. Fifty-two percent were located in the calcaneal-scaphoid joint, and 40% in the calcaneal-talar joint. Treatment was conservative in 44.4% of cases and surgical in 56% (coalition resection). There was only one case of recurrence. The results were mostly excellent or good (88%) after a mean follow-up period of 4 years. CONCLUSIONS: The most frequently diagnosed type of tarsal coalition was that located in the calcaneal-scaphoid joint followed by the calcaneal-talar joint, but they can appear in any joint of the foot. Almost half responded well to conservative treatment with mostly good results, but the rest required surgical treatment due to persistence of the symptoms, the results of which were excellent in all cases except one who suffered a recurrence. In cases of calcaneal-talar coalitions associated with severe hindfoot valgus, correction of this deformity, associated or not with resection of the coalition, is recommended.

Correction: Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds.

Correction for 'Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds' by L. Fernandez et al., Nanoscale, 2020, 12, 22258-22267, DOI: 10.1039/D0NR04964F.

The impact of the COVID-19 pandemic on the Ontario Cervical Screening Program, colposcopy and treatment services in Ontario, Canada: a population-based study.

OBJECTIVE: To describe the immediate impact of the COVID-19 pandemic on cervical screening, colposcopy and treatment volumes in Ontario, Canada. DESIGN: Population-based retrospective observational study. SETTING: Ontario, Canada. POPULATION: People with a cervix age of 21-69 years who completed at least one cervical screening cytology test, colposcopy or treatment procedure for cervical dysplasia between January 2019 and August 2020. METHODS: Administrative databases were used to compare cervical screening cytology, colposcopy and treatment procedure volumes before (historical comparator) and during the first 6 months of the COVID-19 pandemic (March-August 2020). MAIN OUTCOME MEASURES: Changes in cervical screening cytology, colposcopy and treatment volumes; individuals with high-grade cytology awaiting colposcopy. RESULTS: During the first 6 months of the COVID-19 pandemic, the monthly average number of cervical screening cytology tests, colposcopies and treatments decreased by 63.8% (range: -92.3 to -41.0%), 39.7% (range: -75.1 to -14.3%) and 31.1% (range: -43.5 to -23.6%), respectively, when compared with the corresponding months in 2019. Between March and August 2020, on average 292 (-51.0%) fewer high-grade cytological abnormalities were detected through screening each month. As of August 2020, 1159 (29.2%) individuals with high-grade screening cytology were awaiting follow-up colposcopy. CONCLUSIONS: The COVID-19 pandemic has had a substantial impact on key cervical screening and follow-up services in Ontario. As the pandemic continues, ongoing monitoring of service utilisation to inform system response and recovery is required. Future efforts to understand the impact of COVID-19-related disruptions on cervical cancer outcomes will be needed. TWEETABLE ABSTRACT: COVID-19 has had a substantial impact on cervical screening and follow-up services in Ontario, Canada.

Syndromic clubfoot beyond arthrogryposis and myelomeningocele: orthopedic treatment with Ponseti method. / Pie zambo sindrómico más allá de la artrogriposis y el mielomeningocele: tratamiento ortopédico con el método de Ponseti.

INTRODUCTION: Talipes equinovarus or clubfoot is a congenital deformity of the foot with bone, muscle, and tendon involvement. It's one of the most frequent foot malformations in pediatric orthopedics. Although generally idiopathic, it may have a syndromic cause and be associated with musculoskeletal, neurological, or connective tissue conditions. The treatment of choice in idiopathic clubfoot is the Ponseti method based on manipulation and fixation with serial casts that seek progressive correction of the deformity. The Ponseti method effectiveness has been demonstrated in arthrogryposis and myelomeningocele clubfoot. There are few clinical studies demonstrating the efficacy of this therapeutic option in patients with syndromic clubfoot. MATERIAL AND METHODS: Retrospective study with 6 patients (9 feet) with syndromic clubfoot treated in a tertiary center with the Ponseti method with a minimum follow up of two years (2-18). The results were evaluated with the Pirani classification, assessing clubfoot severity before and after treatment. RESULTS: Of the six patients treated were used an average of 6.5 casts. The Pirani scale obtained a mean score of 5.2 before treatment, with a decrease to 1.27 after treatment, with a mean improvement of 3.93 points. In more than half of the cases it was necessary to lengthen the Achilles tendon to correct the equine deformity. In addition, an ankle-foot orthosis was used to reduce recurrences in patients with dysmetria or psychomotor retardation. The most frequently observed residual deformity was the adduct. A patient relapsed twice. CONCLUSIONS: The Ponseti method obtains effective results in the correction of syndromic clubfoot, although it requires a greater number of corrective casts than other pediatric foot pathologies.

Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds.

One-atom-thick rare-earth/noble metal (RE-NM) compounds are attractive materials to investigate two-dimensional magnetism, since they are easy to synthesize into a common RE-NM2 structure with high crystal perfection. Here we perform a comparative study of the GdAu2, HoAu2, and YbAu2 monolayer compounds grown on Au(111). We find the same atomic lattice quality and moiré superlattice periodicity in the three cases, but different electronic properties and magnetism. The YbAu2 monolayer reveals the characteristic electronic signatures of a mixed-valence configuration in the Yb atom. In contrast, GdAu2 and HoAu2 show the trivalent character of the rare-earth and ferromagnetic transitions below 22 K. Yet, the GdAu2 monolayer has an in-plane magnetic easy-axis, versus the out-of-plane one in HoAu2. The electronic bands of the two trivalent compounds are very similar, while the divalent YbAu2 monolayer exhibits different band features. In the latter, a strong 4f-5d hybridization is manifested in neatly resolved avoided crossings near the Fermi level. First principles theory points to a residual presence of empty 4f states, explaining the fluctuating valence of Yb in the YbAu2 monolayer.

Tratamiento de las malformaciones en extremidades en el síndrome de bridas amnióticas: a propósito de un caso / Amniotic band syndrome: management of skeletal limb abnormalities. A case report

El síndrome de bridas amnióticas es un complejo de anomalías congénitas causadas por la rotura prematura del amnios, por lo que se originan bandas fibrosas que comprimen determinadas regiones del feto. Afecta a entre 1:1200 y 1:15 000 recién nacidos vivos según las series consultadas.La clínica típica consiste en alteraciones en las extremidades (anillos de constricción, amputaciones asimétricas más o menos distales, sindactilias y pie zambo), y se han descrito alteraciones toracoabdominales o faciales. Recientes trabajos han demostrado la utilidad del método de Ponseti en el tratamiento del pie zambo asociado al síndrome de bridas amnióticas. Se presenta el caso de un recién nacido que padecía un síndrome de bridas amnióticas y se ahonda en el manejo y la resolución quirúrgica de las malformaciones en las extremidades. En especial, se analiza la utilización del método de Ponseti en el tratamiento del pie zambo congénito sindrómic

Amniotic band syndrome consists in a group of congenital abnormalities caused by strands of the amniotic sac that entangle some parts of the fetus. Those strands result from premature rupture of amnios. The incidence of amniotic band syndrome is 1:1200 to 1:15,000 live births, depending on case studies.Mostly affected parts of fetus are limbs (asymmetric amputations, syndactyly and clubbed foot) but facial and thoracoabdominal abnormalities have also been described.Recent works have proved the utility of Ponseti method to treat clubfoot associated with amniotic band syndrome. We report the case of a newborn with amniotic band syndrome focusing on management and surgical repair of limbs deformities. Especially, we highlight the use of Ponseti method in treatment of syndromic clubfoot

[Amniotic band syndrome: management of skeletal limb abnormalities. A case report]. / Tratamiento de las malformaciones en extremidades en el síndrome de bridas amnióticas: a propósito de un caso.

Amniotic band syndrome consists in a group of congenital abnormalities caused by strands of the amniotic sac that entangle some parts of the fetus. Those strands result from premature rupture of amnios. The incidence of amniotic band syndrome is 1:1200 to 1:15,000 live births, depending on case studies. Mostly affected parts of fetus are limbs (asymmetric amputations, syndactyly and clubbed foot) but facial and thoracoabdominal abnormalities have also been described. Recent works have proved the utility of Ponseti method to treat clubfoot associated with amniotic band syndrome. We report the case of a newborn with amniotic band syndrome focusing on management and surgical repair of limbs deformities. Especially, we highlight the use of Ponseti method in treatment of syndromic clubfoot.

El síndrome de bridas amnióticas es un complejo de anomalías congénitas causadas por la rotura prematura del amnios, por lo que se originan bandas fibrosas que comprimen determinadas regiones del feto. Afecta a entre 1:1200 y 1:15 000 recién nacidos vivos según las series consultadas. La clínica típica consiste en alteraciones en las extremidades (anillos de constricción, amputaciones asimétricas más o menos distales, sindactilias y pie zambo), y se han descrito alteraciones toracoabdominales o faciales. Recientes trabajos han demostrado la utilidad del método de Ponseti en el tratamiento del pie zambo asociado al síndrome de bridas amnióticas. Se presenta el caso de un recién nacido que padecía un síndrome de bridas amnióticas y se ahonda en el manejo y la resolución quirúrgica de las malformaciones en las extremidades. En especial, se analiza la utilización del método de Ponseti en el tratamiento del pie zambo congénito sindrómico.

Rapid detection of ciguatoxins in Gambierdiscus and Fukuyoa with immunosensing tools.

Consumption of seafood contaminated with ciguatoxins (CTXs) leads to a foodborne disease known as ciguatera. Primary producers of CTXs are epibenthic dinoflagellates of the genera Gambierdiscus and Fukuyoa. In this study, thirteen Gambierdiscus and Fukuyoa strains were cultured, harvested at exponential phase, and CTXs were extracted with an implemented rapid protocol. Microalgal extracts were obtained from pellets with a low cell abundance (20,000 cell/mL) and were then analyzed with magnetic bead (MB)-based immunosensing tools (colorimetric immunoassay and electrochemical immunosensor). It is the first time that these approaches are used to screen Gambierdiscus and Fukuyoa strains, providing not only a global indication of the presence of CTXs, but also the ability to discriminate between two series of congeners (CTX1B and CTX3C). Analysis of the microalgal extracts revealed the presence of CTXs in 11 out of 13 strains and provided new information about Gambierdiscus and Fukuyoa toxin profiles. The use of immunosensing tools in the analysis of microalgal extracts facilitates the elucidation of further knowledge regarding these dinoflagellate genera and can contribute to improved ciguatera risk assessment and management.

Osteocondromatosis sinovial de rodilla: una causa infrecuente de gonalgia en edad pediátrica / Synovial chondromatosis of the knee. A rare cause of knee pain in pediatric age

La osteocondromatosis sinovial es una metaplasia benigna de la membrana sinovial que afecta a 1 de cada 100 000 personas, en su mayoría adultos, y es extremadamente infrecuente en edad pediátrica. Predomina en grandes articulaciones, sobre todo la rodilla, y la sintomatología es, por lo general, inespecífica. Dado que la radiografía simple no suele ser concluyente, se recurre a la resonancia magnética nuclear y a la tomografía axial computarizada para orientar el diagnóstico. Se expone el caso de una paciente de 10 años de edad con gonalgia y dismorfia en la patela izquierda de seis meses de evolución, con diagnóstico de osteocondromatosis sinovial. Se presenta el caso dado que se trata de una entidad muy rara en niños, pero que requiere un tratamiento quirúrgico precoz para evitar sus posibles complicaciones, como la destrucción articular progresiva o la malignización a condrosarcoma.

Synovial osteochondromatosis consists of a synovial metaplasia which affects 1 per 100 000 people. It is a very rare disease among children. It typically affects large joints of the body, especially the knee. Due to the lack of specificity of the signs and symptoms and X-Ray images, imaging tests such as nuclear magnetic resonance or computerized tomography are frequently needed for diagnosis.We report a case of a ten-year-old female patient with a six months history of pain and deformity of left patella which was diagnosed with synovial osteochondromatosis. This case highlights the importance of clinical suspicion, not only because it is an extremely rare disease in children, but also because it needs a surgical treatment as soon as possible in order to avoid consequences it might have in pediatric age, as joint destruction or malignization to chondrosarcoma.

[Synovial chondromatosis of the knee. A rare cause of knee pain in pediatric age]. / Osteocondromatosis sinovial de rodilla: una causa infrecuente de gonalgia en edad pediátrica.

Synovial osteochondromatosis consists of a synovial metaplasia which affects 1 per 100 000 people. It is a very rare disease among children. It typically affects large joints of the body, especially the knee. Due to the lack of specificity of the signs and symptoms and X-Ray images, imaging tests such as nuclear magnetic resonance or computerized tomography are frequently needed for diagnosis. We report a case of a ten-year-old female patient with a six months history of pain and deformity of left patella which was diagnosed with synovial osteochondromatosis. This case highlights the importance of clinical suspicion, not only because it is an extremely rare disease in children, but also because it needs a surgical treatment as soon as possible in order to avoid consequences it might have in pediatric age, as joint destruction or malignization to chondrosarcoma.

La osteocondromatosis sinovial es una metaplasia benigna de la membrana sinovial que afecta a 1 de cada 100 000 personas, en su mayoría adultos, y es extremadamente infrecuente en edad pediátrica. Predomina en grandes articulaciones, sobre todo la rodilla, y la sintomatología es, por lo general, inespecífica. Dado que la radiografía simple no suele ser concluyente, se recurre a la resonancia magnética nuclear y a la tomografía axial computarizada para orientar el diagnóstico. Se expone el caso de una paciente de 10 años de edad con gonalgia y dismorfia en la patela izquierda de seis meses de evolución, con diagnóstico de osteocondromatosis sinovial. Se presenta el caso dado que se trata de una entidad muy rara en niños, pero que requiere un tratamiento quirúrgico precoz para evitar sus posibles complicaciones, como la destrucción articular progresiva o la malignización a condrosarcoma.

Prediction and observation of an antiferromagnetic topological insulator.

Magnetic topological insulators are narrow-gap semiconductor materials that combine non-trivial band topology and magnetic order1. Unlike their nonmagnetic counterparts, magnetic topological insulators may have some of the surfaces gapped, which enables a number of exotic phenomena that have potential applications in spintronics1, such as the quantum anomalous Hall effect2 and chiral Majorana fermions3. So far, magnetic topological insulators have only been created by means of doping nonmagnetic topological insulators with 3d transition-metal elements; however, such an approach leads to strongly inhomogeneous magnetic4 and electronic5 properties of these materials, restricting the observation of important effects to very low temperatures2,3. An intrinsic magnetic topological insulator-a stoichiometric well ordered magnetic compound-could be an ideal solution to these problems, but no such material has been observed so far. Here we predict by ab initio calculations and further confirm using various experimental techniques the realization of an antiferromagnetic topological insulator in the layered van der Waals compound MnBi2Te4. The antiferromagnetic ordering  that MnBi2Te4  shows makes it invariant with respect to the combination of the time-reversal and primitive-lattice translation symmetries, giving rise to a ℤ2 topological classification; ℤ2 = 1 for MnBi2Te4, confirming its topologically nontrivial nature. Our experiments indicate that the symmetry-breaking (0001) surface of MnBi2Te4 exhibits a large bandgap in the topological surface state. We expect this property to eventually enable the observation of a number of fundamental phenomena, among them quantized magnetoelectric coupling6-8 and axion electrodynamics9,10. Other exotic phenomena could become accessible at much higher temperatures than those reached so far, such as the quantum anomalous Hall effect2 and chiral Majorana fermions3.