Tag: pathology notes

General pathology is the foundation of everything else in pathology, and it is the part most worth learning properly because it repeats across every organ system. These are original, plain-language summaries and flowcharts to make revision fast — no scraped textbook text, no pirated PDFs.

Use this page as your revision map, then build your own full notes using the system in my pathology notes guide.

Cell injury and cell death

Reversible injury → cell swelling, fatty change, blebbing. Irreversible injury → membrane damage, mitochondrial failure, calcium influx, enzymatic digestion.

Mechanisms to remember as a chain:

Ischaemia → ATP depletion → failure of Na⁺/K⁺ ATPase → cell swelling → anaerobic metabolism → acidosis → ribosome detachment → decreased protein synthesis → mitochondrial damage → irreversible injury → necrosis or apoptosis.

Know the difference cold: necrosis (pathological, inflammatory, membrane rupture) versus apoptosis (regulated, energy-dependent, no inflammation), and the subtypes of necrosis — coagulative, liquefactive, caseous, fat and fibrinoid.

Adaptations

• Hypertrophy — increase in cell size.
• Hyperplasia — increase in cell number.
• Atrophy — decrease in size and function.
• Metaplasia — reversible change of one adult cell type to another.
• Dysplasia — disordered growth, a precursor to malignancy.

Acute inflammation

The five cardinal signs: redness, heat, swelling, pain and loss of function.

• Vascular phase: vasodilation, increased permeability.
• Cellular phase: margination, rolling, adhesion, transmigration, chemotaxis, phagocytosis.
• Mediators: histamine, prostaglandins, leukotrienes, cytokines, complement, nitric oxide.

Then know the morphological patterns — serous, fibrinous, suppurative, ulcerative — and the outcomes: resolution, healing by fibrosis, chronic inflammation or abscess.

Chronic inflammation and granulomas

Characterised by mononuclear infiltration, tissue destruction and repair. Granuloma = collection of activated macrophages (epithelioid cells, giant cells) — caseating (tuberculosis) or non-caseating (sarcoidosis, Crohn’s, foreign body).

Haemodynamic disorders

• Oedema: increased hydrostatic pressure, reduced oncotic pressure, lymphatic obstruction, sodium retention.
• Thrombosis: Virchow’s triad — endothelial injury, stasis/turbulence, hypercoagulability.
• Embolism: thromboembolism, fat, air, amniotic fluid.
• Infarction: red vs white; lung, liver and kidney pattern differences.
• Shock: hypovolaemic, cardiogenic, distributive (septic, anaphylactic, neurogenic), obstructive.

Neoplasia

• Benign vs malignant: differentiation, rate of growth, local invasion, metastasis.
• Carcinogenesis: initiation → promotion → progression, with oncogenes and tumour suppressor genes (RB, p53).
• Spread: direct, lymphatic, haematogenous, transcoelomic.
• Staging vs grading: grading = differentiation; staging = extent (TNM).
• Tumour markers: learn the classic associations (e.g., AFP, CEA, CA-125, PSA).

How to revise general pathology fast

1. Redraw each flowchart from memory daily for a week.
2. Tabulate every “versus” pair the examiner loves: reversible vs irreversible, necrosis vs apoptosis, benign vs malignant, transudate vs exudate.
3. Attach one clinical example to each mechanism.
4. Solve previous-year questions topic by topic.

Frequently asked questions

Where can I get free general pathology notes?

Use original summaries and flowcharts like those on this page, and build your own structured notes from your prescribed textbook. Avoid pirated textbook PDFs, which are both unethical and often unreliable.

What are the most important topics in general pathology?

Cell injury and death, inflammation and repair, haemodynamic disorders, neoplasia and immunopathology — these underpin the entire subject and dominate exam questions.

How do I remember pathology flowcharts?

Redraw them from memory at increasing intervals; the act of reconstructing the chain is far more effective than re-reading it. Pair this with the flashcards from your general pathology topics.

Are these notes enough for MBBS exams?

They are a revision framework, not a substitute for your textbook. Use them to structure and test your knowledge, and expand each point from your prescribed reading.

Educational use only. This guide is written for medical students and is not medical advice. Clinical protocols, drug doses and guidelines change — always verify against the latest standard textbooks and official NMC / institutional guidance before applying anything in practice. Read the full disclaimer.

Frequently Asked Questions (FAQ)

Common questions asked by medical students regarding this topic: