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Multiple Comparison Tests01:13

Multiple Comparison Tests

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Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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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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Chi-square Analysis02:46

Chi-square Analysis

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The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an observed value. In the context of genetics, it enables us to either accept or reject a hypothesis, based on how much the observed values deviate from the expected values.
The chi-square test was developed by Pearson in 1990.
The first step of performing a Chi-square analysis is to establish a null hypothesis, which assumes that there is no real...
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Taxonomy01:31

Taxonomy

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Taxonomy is the science of defining and naming groups of biological organisms based on shared characteristics. It uses a hierarchy of increasingly inclusive categories with Latin names. The smallest units of taxonomy, species and genus, are used to assign a formal, taxonomic name to each species in a system. This classification system, referred to as binomial nomenclature, was formalized by Carolus Linnaeus in the 18th century.
Hierarchy of Taxonomy
The hierarchy that Carolus Linnaeus first...
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Cochran's Q Test01:17

Cochran's Q Test

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Cochran's Q Test is a nonparametric statistical test used to determine if there are potential differences in the outcomes of three or more related groups on a binary (yes/no) or dichotomous outcome. It is essentially an extension of the McNemar Test, which is limited to two related samples - Cochran's Q test can handle three or more related samples, making it more versatile in scenarios where subjects are measured under multiple conditions. The test statistic follows a Chi-Square...
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Updated: Oct 7, 2025

Point of Care Transcranial Color-Coded Duplex Ultrasound of the Middle Cerebral Artery
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Cobb's Tufts: A Systematic Review.

Ibrahim Almafreji1, Alex Manton2, Fraser S Peck3,4

  • 1Emergency Department, University Hospital Hairmyres, East Kilbride, GBR.

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|January 10, 2022
PubMed
Summary
This summary is machine-generated.

Cobb's tufts, or iris vascular tufts, are tiny blood vessel clusters on the iris. This review of 115 cases found they are often asymptomatic but can cause hyphema, with uncertain etiology but links to systemic conditions.

Keywords:
cobb's tuftshyphemairis microhaemangiomairis vascular tuftsspontaneous hyphema

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Area of Science:

  • Ophthalmology
  • Vascular Biology

Background:

  • Cobb's tufts, also known as iris vascular tufts (IVT) and iris microhemangiomas (IMH), are characterized by clustered minute blood vessels at the iris pupillary border.
  • These vascular anomalies can be associated with various systemic conditions, although their precise etiology remains unclear.

Purpose of the Study:

  • To systematically review existing literature on Cobb's tufts.
  • To provide an updated analysis of reported cases, clinical presentation, and management strategies.

Main Methods:

  • A systematic literature search was conducted across major databases: PubMed, Google Scholar, Cochrane, and Embase.
  • Inclusion criteria encompassed full-text English language articles of any publication year.
  • Data from 115 reported cases of Cobb's tufts were extracted and analyzed.

Main Results:

  • The review incorporated data from 38 articles, analyzing 115 cases of Cobb's tufts.
  • Patients ranged from 36 to 86 years old, with no significant sex or racial predisposition identified.
  • Most cases were asymptomatic and bilateral; spontaneous hyphema presenting as blurred vision was the most common symptomatic presentation. Associations with myotonic dystrophy and diabetes were noted.

Conclusions:

  • Cobb's tufts are vascular anomalies of the iris with uncertain etiology, potentially linked to systemic diseases like diabetes.
  • While often asymptomatic, complications like hyphema necessitate management including observation, laser therapy, or iridectomy.
  • Fluorescein angiography is a useful diagnostic tool for investigating these iris vascular tufts.