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Related Concept Videos

The Availability Heuristic01:08

The Availability Heuristic

A heuristic is a general problem-solving framework (Tversky & Kahneman, 1974). You can think of these as mental shortcuts that are used to solve problems. Different types of heuristics are used in different types of situations, and the impulse to use a heuristic occurs when one of five conditions is met (Pratkanis, 1989):
Hindsight Biases01:12

Hindsight Biases

Hindsight bias leads you to believe that the event you just experienced was predictable, even though it really wasn’t. In other words, you knew all along that things would turn out the way they did. Can you relate this to the phrase "Hindsight is 20/20" now?
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Null and Alternative Hypotheses01:16

Null and Alternative Hypotheses

The actual hypothesis testing begins by considering two hypotheses. They are termed  the null hypothesis and the alternative hypothesis. These hypotheses contain opposing viewpoints.
The null hypothesis, denoted by H0 is a statement of no difference between the variables—they are not related. This can often be considered the status quo. As  a result if you cannot accept the null, it requires some action.
The alternative hypothesis, denoted by H1 or Ha, is a claim about the population that is...
Criteria for Causality: Bradford Hill Criteria - I01:30

Criteria for Causality: Bradford Hill Criteria - I

The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:
Cause and Effect01:53

Cause and Effect

While variables are sometimes correlated because one does cause the other, it could also be that some other factor, a confounding variable, is actually causing the systematic movement in our variables of interest. For instance, as sales in ice cream increase, so does the overall rate of crime. Is it possible that indulging in your favorite flavor of ice cream could send you on a crime spree? Or, after committing crime do you think you might decide to treat yourself to a cone?

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Related Experiment Video

Updated: May 16, 2026

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia
06:15

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia

Published on: August 9, 2024

Occam's razor or Hickam's dictum?

Nishant Gupta1, Alejandro Aragaki, Kathryn A Wikenheiser-Brokamp

  • 1Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, University of Cincinnati, Cincinnati, OH, USA. guptans@ucmail.uc.edu

Journal of Bronchology & Interventional Pulmonology
|December 5, 2012
PubMed
Summary

Sarcoidosis and histoplasmosis share similar symptoms, making diagnosis challenging. This case highlights histoplasmosis potentially preceding or triggering sarcoidosis development.

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Last Updated: May 16, 2026

Anterior High-Resolution Optical Coherence Tomography in the Diagnosis and Therapeutic Monitoring of Ocular Surface Squamous Neoplasia
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Published on: August 9, 2024

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Published on: October 13, 2018

Area of Science:

  • Pulmonology
  • Infectious Diseases
  • Immunology

Background:

  • Sarcoidosis is a multisystemic inflammatory disease of unknown etiology, commonly affecting the lungs with non-necrotizing granulomas.
  • Histoplasmosis, a fungal infection caused by Histoplasma capsulatum, also primarily affects the lungs, typically presenting with necrotizing granulomas.

Observation:

  • A young male patient presented with clinical and radiographic features that initially suggested a difficult differentiation between sarcoidosis and histoplasmosis.
  • The patient was found to have histopathologic evidence of histoplasmosis.

Findings:

  • Following the diagnosis of histoplasmosis, the patient subsequently developed sarcoidosis.
  • This case demonstrates the potential for histoplasmosis to be a precursor or contributing factor in the development of sarcoidosis.

Implications:

  • The overlapping clinical and radiographic presentations of sarcoidosis and histoplasmosis necessitate careful diagnostic evaluation.
  • Further research is warranted to explore the potential role of Histoplasma capsulatum infection as an etiologic agent in sarcoidosis pathogenesis.