# Nodule Knowledge — Education Hub

Guided lessons and reference material on pulmonary nodule classification, imaging features,
and clinical context. Built for clinicians, students, patients, and anyone else curious
about what a radiology report is actually describing.

## Lessons

**[Nodule Types](https://nodule.app/tutorial)** — *Tutorial.* What nodules are and how size,
density, and margin shape follow-up decisions. Four chapters: the definition of a pulmonary
nodule, the size thresholds that drive Fleischner and Lung-RADS management, the three
density types (solid, ground glass, part-solid), and the three margin types (smooth,
lobulated, spiculated). Markdown: [/tutorial.md](https://nodule.app/tutorial.md)

**[Lung Cancer Facts](https://nodule.app/lung-cancer-facts)** — *Facts & Stats.* Eight cards
of statistics on incidence, mortality, risk, and the power of early detection: why lung
cancer kills more Americans than any other cancer, how it compares with colorectal, breast,
and prostate cancer, how many patients receive no treatment at all, and how much survival
depends on stage at diagnosis. Markdown:
[/lung-cancer-facts.md](https://nodule.app/lung-cancer-facts.md)

**[Risk Factors & Symptoms](https://nodule.app/risk-factors)** — *Symptoms & Risk.* Common
causes of lung cancer, the B.R.E.A.T.H.E. symptom framework, why so many nodules are found
incidentally during routine scans, and the USPSTF screening criteria. Markdown:
[/risk-factors.md](https://nodule.app/risk-factors.md)

**[What Is a Biomarker?](https://nodule.app/biomarker-basics)** — *Foundations.* The
molecular signals hidden in your biology: what biomarkers are, how they are found in tissue
or in blood, and why they change the way cancer is treated. Markdown:
[/biomarker-basics.md](https://nodule.app/biomarker-basics.md)

**[Biomarker Testing](https://nodule.app/biomarker-testing)** — *Testing & Diagnosis.* How
molecular profiling identifies the driver mutations behind lung cancer, which mutations
matter (EGFR, ALK, ROS1, KRAS G12C), how next-generation sequencing works, and why asking
for NGS at diagnosis matters. Markdown:
[/biomarker-testing.md](https://nodule.app/biomarker-testing.md)

**[Glossary](https://nodule.app/glossary)** — *Reference.* Key imaging and clinical terms
defined and explained in plain language, each with why it matters and a citation. Markdown:
[/glossary.md](https://nodule.app/glossary.md)

## Knowledge check

**[Quiz: Test Your Knowledge](https://nodule.app/quiz)** — ten questions drawn at random
from a bank spanning every lesson, each with an explanation and a source citation. Markdown:
[/quiz.md](https://nodule.app/quiz.md)

## Beyond the lessons

- [3D and AR nodule viewer](https://nodule.app/viewer) — morphology and scale, rendered at
  1:1 in augmented reality.
- [Malignancy risk calculator](https://nodule.app/calculator) — the Mayo Clinic model with
  its arithmetic shown.
- [References and disclaimer](https://nodule.app/references) — every guideline and paper
  the lessons are built on.

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*Educational use only · Not a medical device.* This document mirrors the page at
<https://nodule.app/education>.