science

Mallory body

Mallory body is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mallory body rather than just read about it. In short: In histopathology, a Mallory body, Mallory–Denk body (MDB), or Mallory's hyaline is an inclusion found in the cytoplasm of liver cells. Mallory bodies are damaged intermediate filaments within the liver cells.

Key takeaways

Mallory body belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mallory body to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mallory body from memory before moving on to harder problems.

Reference excerpt

In histopathology, a Mallory body, Mallory–Denk body (MDB), or Mallory's hyaline is an inclusion found in the cytoplasm of liver cells. Mallory bodies are damaged intermediate filaments within the liver cells.

Associated conditions Mallory bodies are classically found in the livers of people suffering from alcohol-induced liver disease and were once thought to be specific for that. They are most common in alcoholic hepatitis (prevalence of 65%) and alcoholic cirrhosis (prevalence of 51%). They are a recognized feature of Wilson's disease (25%), primary biliary cirrhosis (24%), non-alcoholic cirrhosis (24%), hepatocellular carcinoma (23%) and morbid obesity (8%), among other conditions. However, it has also been reported in certain other unrelated conditions.

Appearance Mallory bodies are highly eosinophilic and thus appear pink on H&E stain. The bodies themselves are made up of intermediate cytokeratin 8/18 filament proteins that have been ubiquitinated, or bound by other proteins such as heat shock proteins, or p62/Sequestosome 1.

Eponym It is named for the American pathologist Frank Burr Mallory, who first described the structures in 1911. A renaming as Mallory–Denk bodies was proposed in 2007 to honor the contribution of Austrian pathologist Helmut Denk for the molecular analysis of the pathogenesis of MDBs.

Additional images

See also Ballooning degeneration – another histopathologic finding of steatohepatitis

References

Illustrations

Worked examples

Example 1 — a first encounter with Mallory body

Start with the simplest possible case. Write down what Mallory body claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mallory body before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mallory body ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mallory body

In research: Mallory body appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mallory body in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mallory body is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alcohol and health, Histopathology, so understanding it makes those chapters shorter.
In everyday life: Look for Mallory body outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Mallory body in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mallory body means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mallory body out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mallory body in simple terms?

Why does Mallory body matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mallory body?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mallory body.