In the absence of Verocay bodies, the cytologic appearance of schwannomas can be quite nonspecific, with the differential diagnosis including a number of spindle cell lesions. The diagnostic accuracy can be enhanced by the use of electron microscopy (EM) and immunocytochemistry; both techniques are easily applicable to aspirated material. Six cases of schwannoma, diagnosed as such preoperatively by the application of these techniques, are reported. Only two of the cases showed Verocay bodies on light microscopy. Electron microscopy, performed on four cases, revealed a complex arrangement of long cell processes, with scattered desmosomelike structures, a prominent focally reduplicated basal lamina and long-spacing collagen. All of the cases showed positive staining for S-100 protein.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Improving the accuracy of temperature measurement on TEM samples using plasmon energy expansion thermometry (PEET): Addressing sample thickness effects.
Ultramicroscopy
January 2025
National Centre for Nano Fabrication and Characterization (DTU Nanolab), Technical University of Denmark (DTU), Kgs. Lyngby, Denmark. Electronic address:
Advances in analytical scanning transmission electron microscopy (STEM) and in microelectronic mechanical systems (MEMS) based microheaters have enabled in-situ materials' characterization at the nanometer scale at elevated temperature. In addition to resolving the structural information at elevated temperatures, detailed knowledge of the local temperature distribution inside the sample is essential to reveal thermally induced phenomena and processes. Here, we investigate the accuracy of plasmon energy expansion thermometry (PEET) as a method to map the local temperature in a tungsten (W) lamella in a range between room temperature and 700 °C.
View Article and Find Full Text PDFLong-Range Charge Transport Facilitated by Electron Delocalization in MoS and Carbon Nanotube Heterostructures.
ACS Nano
January 2025
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.
Controlling charge transport at the interfaces of nanostructures is crucial for their successful use in optoelectronic and solar energy applications. Mixed-dimensional heterostructures based on single-walled carbon nanotubes (SWCNTs) and transition metal dichalcogenides (TMDCs) have demonstrated exceptionally long-lived charge-separated states. However, the factors that control the charge transport at these interfaces remain unclear.
View Article and Find Full Text PDFBond strength to eroded dentin as per chlorhexidine use for controlling erosive wear or interface aging: an 18-month assay.
Braz Oral Res
January 2025
Universidade de São Paulo - USP, School of Dentistry, Department of Operative Dentistry, São Paulo, SP, Brazil.
The aim of this study was to assess the effect of a chlorhexidine digluconate solution (CHX) applied as an antiproteolytic agent for controlling erosive tooth wear or as part of the adhesive treatment on long-term bond strength to eroded dentin. Dentin specimens were abraded with a 600-grit silicon carbide (SiC) paper for 1 min (sound dentin - S), subsequently treated with 2% CHX for 1 min (with excess removed, followed by a 6-hour rest), and eroded by exposure to Coca-Cola for 5 min, three times a day, for 5 days (CHX-treated and eroded dentin - CHXE), or only eroded (eroded dentin - E). The specimens were acid-etched (15 s), rinsed (30 s), dried (15 s), and rehydrated with 1.
View Article and Find Full Text PDFTransient interactions between the fuzzy coat and the cross-β core of brain-derived Aβ42 filaments.
Sci Adv
January 2025
Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.
Several human disorders, including Alzheimer's disease (AD), are characterized by the aberrant formation of amyloid fibrils. In many cases, the amyloid core is flanked by disordered regions, known as fuzzy coat. The structural properties of fuzzy coats, and their interactions with their environments, however, have not been fully described to date.
View Article and Find Full Text PDFTuning the electronic structure and SMSI by integrating trimetallic sites with defective ceria for the CO reduction reaction.
Proc Natl Acad Sci U S A
January 2025
Department of Chemical Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India.
Heterogeneous catalysts have emerged as a potential key for closing the carbon cycle by converting carbon dioxide (CO) into value-added chemicals. In this work, we report a highly active and stable ceria (CeO)-based electronically tuned trimetallic catalyst for CO to CO conversion. A unique distribution of electron density between the defective ceria support and the trimetallic nanoparticles (of Ni, Cu, Zn) was established by creating the strong metal support interaction (SMSI) between them.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!