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Related Concept Videos

Classification of Epithelial Tissues: Overview01:22

Classification of Epithelial Tissues: Overview

Epithelial tissues are classified according to the shape of the cells and the number of cell layers formed. Cell shapes can be squamous (flattened and thin), cuboidal (square-like, as wide as it is tall), or columnar (rectangular, taller than it is wide). Additionally, the nucleus shape helps identify the type of epithelial cells. Squamous cells have flattened disc-shaped nuclei, cuboidal cells have spherical nuclei, and columnar cells have elongated nuclei.
Based on the number of cell layers,...
Classification of Epithelial Tissues: Stratified Epithelium01:29

Classification of Epithelial Tissues: Stratified Epithelium

Stratified epithelium consists of several stacked layers of cells. They provide the durability to withstand constant physical and chemical attacks. Stratified epithelium is named after the shape of the most apical layer of cells. Stratified squamous epithelium is the most common type found in the human body. In this tissue, the apical cells are squamous, whereas the basal layer contains either columnar or cuboidal cells. The basal cells divide to form new daughter cells, which gradually become...
Cellular Adaptation IV: Dysplasia and Metaplasia01:24

Cellular Adaptation IV: Dysplasia and Metaplasia

DysplasiaDysplasia refers to abnormal changes in the size, shape, and organization of mature cells, characterized by pleomorphism, nuclear abnormalities, and increased mitotic activity. It commonly affects epithelial tissues, including the cervix, gastrointestinal tract, respiratory mucosa, and endometrium. Although it may occur alongside hyperplasia, dysplasia is not a true adaptive response but a preneoplastic change with potential to progress to cancer.When confined above the basement...
Classification of Connective Tissues01:30

Classification of Connective Tissues

The connective tissues have different properties and functions in the human body. They are broadly categorized into proper, supporting, or fluid connective tissues.
Connective Tissue Proper
Connective tissue proper is the most abundant class of connective tissues. As its name implies, it predominantly connects different tissues in the body. Depending on the cell types, ground substance, viscosity, and fiber types in the ECM, connective tissue proper is further categorized into loose and dense.
Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
Slow oxidative, muscle fibers appear red due to large numbers of capillaries and high levels of...
Classification of Epithelial Tissues: Glandular Epithelium01:20

Classification of Epithelial Tissues: Glandular Epithelium

The glandular epithelium is made of one or more epithelial cells modified to synthesize and secrete chemical substances. Glandular epithelia can be classified based on cell number. Unicellular glands have individual secretory cells scattered across the epithelial monolayer. In contrast, multicellular glands consist of a hollow tubular duct attached to the cluster of secretory cells located in the deep pockets.
Multicellular glands are formed during early development when epithelial budding...

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Identifying, Diagnosing, and Grading Malignant Peripheral Nerve Sheath Tumors in Genetically Engineered Mouse Models
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[Pleomorphic high-grade soft tissue sarcomas: is the subclassification up to date?].

G Mechtersheimer1, M Renner, R Penzel

  • 1Pathologisches Institut, Universitsklinikum Heidelberg, Im Neuenheimer Feld 220, 69120 Heidelberg, Deutschland. gunhild_mechtersheimer@med.uni-heidelberg.de

Der Pathologe
|January 15, 2011
PubMed
Summary

Accurate classification of pleomorphic high-grade sarcomas is crucial for effective treatment. Integrative analysis of morphology, immunohistochemistry, and genetics refines subtyping for better clinical outcomes.

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Area of Science:

  • Oncology
  • Pathology
  • Genetics

Context:

  • Pleomorphic high-grade sarcomas represent a complex tumor group.
  • Accurate classification was previously challenging.
  • Refined subtyping is now clinically essential.

Purpose:

  • To highlight the evolution of pleomorphic high-grade sarcoma classification.
  • To emphasize the importance of integrative diagnostic approaches.
  • To underscore the clinical and prognostic significance of precise subtyping.

Summary:

  • Integrative analysis (morphological, immunohistochemical, molecular genetic) is key to characterizing pleomorphic high-grade sarcomas.
  • Distinguishing these aggressive tumors from non-sarcomatous malignancies and benign mesenchymal tumors is critical for appropriate therapy.
  • Accurate subtyping aids in separating aggressive from less aggressive sarcomas.

Impact:

  • Enables precise diagnosis and therapy selection for pleomorphic high-grade sarcomas.
  • Improves prognostic accuracy and patient management.
  • Supports the development of gene signatures for diagnostics and prognostics.