biology

Necrolytic migratory erythema

Necrolytic migratory erythema is a biology 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 Necrolytic migratory erythema rather than just read about it. In short: Necrolytic migratory erythema (NME) is a red, blistering rash that spreads across the skin. It particularly affects the skin around the mouth and distal extremities; but may also be found on the lower abdomen, buttocks, perineum, and groin.

Key takeaways

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

Reference excerpt

Necrolytic migratory erythema (NME) is a red, blistering rash that spreads across the skin. It particularly affects the skin around the mouth and distal extremities; but may also be found on the lower abdomen, buttocks, perineum, and groin. It is strongly associated with glucagonoma, a glucagon-producing tumor of the pancreas, but is also seen in a number of other conditions including liver disease and intestinal malabsorption.

Signs and symptoms

Clinical features NME features a characteristic skin eruption of red patches with irregular borders, intact and ruptured vesicles, and crust formation. It commonly affects the limbs and skin surrounding the lips, although less commonly the abdomen, perineum, thighs, buttocks, and groin may be affected. Frequently these areas may be left dry or fissured as a result. All stages of lesion development may be observed synchronously. The initial eruption may be exacerbated by pressure or trauma to the affected areas.

Associated conditions William Becker first described an association between NME and glucagonoma in 1942 and since then, NME has been described in as many as 70% of persons with a glucagonoma. NME is considered part of the glucagonoma syndrome, which is associated with hyperglucagonemia, diabetes mellitus, and hypoaminoacidemia. When NME is identified in the absence of a glucagonoma, it may be considered "pseudoglucagonoma syndrome". Less common than NME with glucagonoma, pseudoglucagonoma syndrome may occur in a number of systemic disorders:

Celiac disease Ulcerative colitis Crohn's disease Hepatic cirrhosis Hepatocellular carcinoma Lung cancer, including small cell lung cancer Tumors that secrete insulin- or insulin-like growth factor 2 Duodenal cancer

Cause The cause of NME is unknown, although various mechanisms have been suggested. These include hyperglucagonemia, zinc deficiency, fatty acid deficiency, hypoaminoacidemia, and liver disease.

Mechanism The pathogenesis is also unknown.

Diagnosis

Histology The histopathologic features of NME are nonspecific and include:

epidermal necrosis subcorneal pustules confluent parakeratosis, epidermal hyperplasia, and marked papillary dermal hyperplasia in a psoriasiform pattern angioplasia of papillary dermis suppurative folliculitis The vacuolated, pale, swollen epidermal cells and necrosis of the superficial epidermis are most characteristic. Immunofluorescence is usually negative.

Management Managing the original condition, glucagonoma, by octreotide or surgery. After resection, the rash typically resolves within days.

Illustrations

Worked examples

Example 1 — a first encounter with Necrolytic migratory erythema

Start with the simplest possible case. Write down what Necrolytic migratory erythema claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Necrolytic migratory erythema 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 Necrolytic migratory erythema 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 Necrolytic migratory erythema

In research: Necrolytic migratory erythema appears in biology 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 Necrolytic migratory erythema 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: Necrolytic migratory erythema is common in secondary-school and first-year university syllabi. It links to neighbouring topics Erythemas, Rare diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Necrolytic migratory erythema 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.

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How to study Necrolytic migratory erythema in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Necrolytic migratory erythema 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 Necrolytic migratory erythema out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Necrolytic migratory erythema in simple terms?

Why does Necrolytic migratory erythema matter?

Because it connects several biology 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 Necrolytic migratory erythema?

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 Necrolytic migratory erythema.