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Classification of Illness

Classification of Illness

The meaning of illness is individualized to each person who experiences an alteration in health. In contrast, disease is a medical term indicating a pathological change in the structure and function of the body or mind. It is a condition that has specific symptoms and boundaries.
An illness is a response to a disease in which the person's level of functioning is changed compared with a previous level. The general classification of illness includes acute and chronic.
Acute illness is severe and...

Classification of Epithelial Tissues: Overview

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.
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Classification of Leukocytes

Classification of Leukocytes

Leukocytes are classified into two groups based on the presence or absence of cytoplasmic granules. Granular leukocytes, which contain granules, belong to the myeloid lineage and are divided into three subtypes: neutrophils, eosinophils, and basophils. These cells are roughly spherical and characterized by the granules in their cytoplasm.
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Classification of Epithelial Tissues: Glandular Epithelium

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.
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Primary Lymphoid Organs

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...

Secondary Lymphoid Organs

Secondary Lymphoid Organs

Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...

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Measurements of the [Formula: see text][Formula: see text] production cross sections in the [Formula: see text] channel in proton-proton collisions at [Formula: see text] and [Formula: see text] and combined constraints on triple gauge couplings.

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Four-color Fluorescence Immunohistochemistry of T-cell Subpopulations in Archival Formalin-fixed, Paraffin-embedded Human Oropharyngeal Squamous Cell Carcinoma Samples

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Interobserver variation in the classification of thymic tumours--a multicentre study using the WHO classification

E T Verghese¹, M A den Bakker, A Campbell

¹Department of Pathology, Leeds Teaching Hospital NHS Trust, Leeds, UK.

|August 30, 2008

Summary

The World Health Organization (WHO) classification for thymic epithelial tumours showed moderate agreement among expert pathologists. Simplifying categories improved diagnostic reproducibility for these rare thoracic tumors.

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Area of Science:

Pathology
Oncology
Thoracic Surgery

Background:

The World Health Organization (WHO) classification is crucial for diagnosing thymic epithelial tumours.
Reproducibility and interobserver variation in this classification are critical for patient management and research.

Purpose of the Study:

To evaluate the reproducibility of the current WHO classification for thymic epithelial tumours.
To assess interobserver variation among experienced thoracic pathologists using this system.

Main Methods:

Ninety-five thymic tumours were reviewed by 17 expert pathologists over one year.
Pathologists classified tumours using WHO criteria, with diagnoses statistically analyzed using kappa values.

Main Results:

Overall agreement among pathologists was moderate (kappa = 0.45).
Agreement improved to 0.62 when tumour categories were grouped, particularly for types A and AB.
Distinguishing between B1, B2, and B3 subtypes presented significant challenges.

Conclusions:

The current WHO classification for thymic epithelial tumours exhibits moderate reproducibility.
Amalgamating certain tumour categories enhances diagnostic agreement, suggesting potential refinements for the classification system.