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Appendicitis

Appendicitis

Appendicitis is an acute inflammatory condition of the vermiform appendix, most commonly caused by obstruction of its lumen. The appendix is a narrow, blind-ended pouch that extends from the cecum, making it particularly prone to obstruction. Causes include fecaliths, lymphoid hyperplasia (often after viral infections), parasites, tumors, or foreign bodies. This obstruction initiates a cascade of pathological changes.Luminal Obstruction and Early InflammationAfter obstruction, normal mucosal...

Appendicitis-I: Introduction

Appendicitis-I: Introduction

The appendix, a small, narrow, blind tube extending from the inferior part of the cecum, is widely regarded as a vestigial organ, having lost much of its original function through evolution. Despite its diminished role, the appendix can become inflamed, a condition known as appendicitis.
Etiology: Appendicitis can arise from various causes, primarily rooted in the obstruction of the appendix lumen. Factors contributing to this obstruction include fecal accumulation, lymphoid hyperplasia and, in...

Cellular Adaptation IV: Dysplasia and Metaplasia

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 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.
Multicellular glands are formed during early development when epithelial budding...

Appendicitis-II: Diagnostic Studies and Management

Appendicitis-II: Diagnostic Studies and Management

Diagnosing and managing appendicitis requires a structured and comprehensive approach that spans from initial assessment to postoperative care. Here is an overview of the process:
Diagnosing Appendicitis
It requires a multifaceted approach, starting with a detailed physical examination to pinpoint the location and nature of the pain and identify any associated symptoms. Laboratory tests play a crucial role. A complete Blood Count (CBC) typically reveals leukocytosis (an increased number of...

Classification of Epithelial Tissues: Simple Epithelium

Classification of Epithelial Tissues: Simple Epithelium

Simple epithelium consists of a single layer of cells that lines body cavities and blood vessels. The shape of the cells in the epithelium reflects the function of the tissue. Cells in simple squamous epithelium appear as thin scales with flat, elliptical nuclei that mirror the form of the cell.
Because of the thinness of the cells, simple squamous epithelium is present where the rapid passage of chemical compounds is observed. For example, the endothelium that lines the capillaries and vessels...

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Related Experiment Video

Updated: Jun 7, 2026

Murine Appendectomy Model of Chronic Colitis Associated Colorectal Cancer by Precise Localization of Caecal Patch

Murine Appendectomy Model of Chronic Colitis Associated Colorectal Cancer by Precise Localization of Caecal Patch

Published on: August 24, 2019

Epithelial neoplasms of the appendix.

¹Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA. tangl@mskcc.org

Archives of Pathology & Laboratory Medicine

|November 4, 2010

Summary

This summary is machine-generated.

Appendiceal epithelial neoplasms, including adenocarcinoma and carcinoid tumors, present diagnostic challenges. Understanding the clinical implications of pathologic assessment is crucial for effective patient management.

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Last Updated: Jun 7, 2026

Murine Appendectomy Model of Chronic Colitis Associated Colorectal Cancer by Precise Localization of Caecal Patch

Murine Appendectomy Model of Chronic Colitis Associated Colorectal Cancer by Precise Localization of Caecal Patch

Published on: August 24, 2019

Area of Science:

Gastroenterology
Pathology
Oncology

Background:

The appendix can develop various epithelial neoplasms with glandular or neuroendocrine features.
Some appendiceal tumors resemble intestinal counterparts, while others like mucinous neoplasms and goblet cell carcinoid tumors are unique.
These unique appendiceal neoplasms pose challenges in classification and management.

Purpose of the Study:

To review clinical and diagnostic issues of three appendiceal epithelial neoplasm types.
Focus on adenocarcinoma (especially mucinous), goblet cell carcinoid tumors with associated adenocarcinoma, and typical carcinoid tumors.

Main Methods:

Review of case-derived material.
Comprehensive literature review.

Main Results:

Adenocarcinoma, mucinous neoplasms, goblet cell carcinoid tumors, and typical carcinoid tumors represent distinct appendiceal epithelial neoplasms.
Clinical and diagnostic features vary among these entities.
Pathologic assessment requires consideration of specific tumor subtypes.

Conclusions:

Accurate pathologic assessment of appendiceal epithelial tumors is vital.
Understanding the clinical implications of each diagnosis is paramount for patient care.