Outcomes of acute inflammation: resolution, abscess, scar or chronic inflammation !

Topic

Acute inflammation ends in one of four ways: full healing, a walled-off abscess, a scar, or a slow chronic process that keeps going.

Updated 2026-11-01

What it is

What follows acute inflammation depends on how much tissue was destroyed, whether the cells can regenerate and whether the cause is removed. Ideally the cause is cleared and the tissue returns to normal (resolution). If tissue is destroyed or fibrin is not cleared, healing is by scarring; pyogenic organisms may leave an abscess; and a persistent cause turns acute into chronic inflammation.

Key facts

Organisation means fibrin or exudate being invaded by granulation tissue and converted into fibrous tissue.
An abscess can heal by drainage and scar, rupture into a cavity, form a sinus or fistula, or seed the blood.
Chronic inflammation may also begin as such, without an acute phase (some viral infections, autoimmunity, inert particles).

Step by step

The cause is removed; mediators are degraded and their sources stop producing them.
Neutrophils die by apoptosis and are engulfed by macrophages (efferocytosis), which switches macrophages to a repair profile.
Pro-resolving lipids (lipoxins, resolvins, protectins), IL-10 and TGF-β stop further leukocyte entry.
Leaky vessels close and lymphatics drain oedema fluid, proteins and debris.
Fibrin is dissolved by fibrinolysis; macrophages clear the rest.
Parenchymal cells regenerate on the intact framework and function returns.

The four outcomes

Outcome	When it happens	Example
Resolution	Limited injury, cause cleared, cells able to regenerate, framework intact	Lobar pneumonia that clears without scarring
Scar or fibrosis	Much tissue destroyed, non-dividing cells, or abundant fibrin not removed	Myocardial infarct scar, pleural or pericardial adhesions
Abscess	Pyogenic organisms; pus walled off	Lung abscess, appendiceal or diverticular abscess
Chronic inflammation	Persistent agent, autoimmunity or repeated injury	Chronic osteomyelitis, peptic ulcer that does not heal

Clinical notes

Organised fibrinous pleuritis or peritonitis leaves adhesions that can restrict breathing or cause bowel obstruction.
A pneumonia that does not resolve may evolve into a lung abscess or empyema; persistent fever despite treatment is a warning sign.

Test yourself

Think of the answer, then tap the question to see it.

Which conditions favour complete resolution?

A short-lived injury, little tissue destruction, removal of the cause, cells that can regenerate and an intact connective tissue framework.

What is organisation of an exudate?

Ingrowth of granulation tissue (new vessels and fibroblasts) into fibrin that was not removed, turning it into fibrous tissue, as in pleural adhesions.

How do macrophages help end acute inflammation?

They engulf apoptotic neutrophils and debris, then release IL-10, TGF-β and pro-resolving lipids that stop leukocyte recruitment and start repair.

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Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: Abscess: MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2026); 4.6 Tissue Injury and Aging (OpenStax (Anatomy and Physiology 2e), 2022); 17.5 Inflammation and Fever (OpenStax (Microbiology), 2016).

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Representative model, for educational purposes only.