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| Technique | Principle | Common Application | | :--- | :--- | :--- | | | Hematoxylin (nuclei-blue) & Eosin (cytoplasm-pink) | General tissue architecture, diagnosing necrosis, inflammation, tumors. | | Immunohistochemistry (IHC) | Antibody-based antigen detection | Identifying tumor origin (e.g., CK7 for lung, CD20 for B-cell lymphoma), hormone receptors (ER/PR in breast cancer). | | Flow Cytometry | Laser-based cell analysis in fluid suspension | Immunophenotyping leukemias/lymphomas, CD4 counts in HIV. | | Fluorescence In Situ Hybridization (FISH) | DNA probes to detect chromosomal abnormalities | HER2/neu amplification in breast cancer, BCR-ABL translocation in CML. | | Next-Generation Sequencing (NGS) | High-throughput DNA sequencing | Comprehensive genomic profiling for targeted therapy selection. | | Frozen Section | Rapid tissue freezing & sectioning (during surgery) | Intraoperative margin assessment (e.g., tumor resection completeness). |
To understand pathology, one must understand the four distinct mechanisms that explain how disease works. These are the intellectual tools a pathologist uses to decipher the language of illness: pathology