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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...

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...

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...

Abdominal Regions and Quadrants

Abdominal Regions and Quadrants

To promote clear communication, for instance, about the location of a patient's abdominal pain or a suspicious mass, anatomists and clinicians typically use imaginary lines to categorize the abdominopelvic cavity into either four quadrants or nine regions to identify organs in the cavity.
The simpler quadrants approach, which is more commonly used in medicine, subdivides the cavity with one horizontal and one vertical line that intersects at the patient's umbilicus (navel). The four quadrants...

Imaging Studies III: Computed Tomography

Imaging Studies III: Computed Tomography

DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...

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Updated: Jul 7, 2026

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

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Published on: August 24, 2019

When the appendix hides: the radiologist's guide to appendix variants and mimics.

Ana Helena Pavan Amaral¹, Carolinna Bonetto Nicolau Bignotto², Eduardo Alves Ferreira Martins^2,3

¹Department of Radiology and Diagnostic Imaging, Vera Cruz Hospital, Campinas, Brazil. anahpamaral@gmail.com.

Abdominal Radiology (New York)

|July 6, 2026

Summary

Diagnosing appendix conditions is challenging due to variable anatomy and atypical presentations. Recognizing diverse appendiceal diseases and their imaging features is crucial for accurate abdominal diagnosis.

Keywords:

Appendiceal Anatomy Appendiceal Neoplasms Appendicitis Appendix Diagnosis, Differential Tomography, X-Ray Computed

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Area of Science:

Radiology
Gastroenterology
Surgical Pathology

Background:

The appendix's variable anatomy and atypical disease presentations pose diagnostic challenges.
Appendiceal pathologies can mimic various abdominal and pelvic conditions, complicating diagnosis.

Purpose of the Study:

To review the normal appendix anatomy, positional variations, and the spectrum of appendiceal diseases.
To highlight the distinct imaging signatures of various appendiceal pathologies.

Main Methods:

This pictorial essay reviews imaging findings of appendiceal conditions.
It discusses the roles of computed tomography (CT) and magnetic resonance imaging (MRI) in diagnosis.

Main Results:

Acute appendicitis, endometriosis, epiploic appendagitis, appendiceal diverticulitis, mucocele, and primary tumors are discussed.
CT is the primary diagnostic tool, while MRI offers complementary value for soft-tissue characterization.

Conclusions:

Accurate interpretation of abdominal imaging requires recognizing anatomical variants and primary mimics of the appendix.
Understanding the diverse spectrum of appendiceal diseases and their imaging features is essential for correct diagnosis.