Passive Congestion and Centrilobular Necrosis

Slide 1 · Passive Congestion and

Centrilobular Necrosis

Hepatic circulation • Zonal vulnerability • Morphologic continuum

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · Learning objectives

01

Locate centrilobular (zone 3) parenchyma and trace hepatic venous drainage.

02

Distinguish passive venous congestion from reduced hepatic perfusion.

03

Explain the morphology of nutmeg liver, pericentral necrosis, and cardiac sclerosis.

04

Interpret the findings alongside cardiac disease, shock, and related outflow disorders.

Slide 3 · Congestion and necrosis form a continuum

Both are hepatic consequences of systemic circulatory compromise.

Venous stasis first changes blood distribution and hepatocyte architecture.

Added or severe hypoxic injury may produce hemorrhagic pericentral necrosis.

The morphologic severity depends on the hemodynamic insult and its duration.

Venous congestion

Hepatocyte atrophy

Hypoxic injury

Centrilobular necrosis

Slide 4 · Classify liver circulatory disturbances by level

Inflow: Hepatic artery or portal venous compromise.

Intrahepatic passage: Impaired sinusoidal circulation.

Outflow: Hepatic venous obstruction or systemic venous backpressure.

The level of disturbance helps predict the morphologic pattern.

Blood inflow

Sinusoidal transit

Venous outflow

Slide 5 · The liver has a dual blood supply

The portal vein provides approximately 60–70% of normal hepatic blood flow.

The hepatic artery contributes approximately 30–40%.

The blood streams mix within sinusoids and drain into hepatic venules.

Dual supply mitigates complete infarction but does not prevent zone 3 hypoxia.

Normal hepatic blood flow

Portal vein

60–70%

Artery

30–40%

Mixed sinusoidal blood → hepatic venules

Slide 6 · Trace blood from portal tract to central vein

Portal venous and hepatic arterial branches accompany bile ducts in portal tracts.

Blood traverses sinusoids between hepatocyte plates.

It drains into terminal hepatic venules (central veins).

Venous backpressure is transmitted toward the centrilobular sinusoidal bed.

Portal vein + hepatic artery

Sinusoids

Central vein

Hepatic veins

Slide 7 · The classic hepatic lobule: Anatomic landmarks

The central vein is located near the center of the classic lobule.

Portal tracts lie at the polygonal periphery.

Parenchyma near the central vein is called pericentral or centrilobular.

A correct zonal diagnosis begins with locating these landmarks.

Central vein

Portal tracts at periphery

Zone 3: Surrounding central vein

Slide 8 · The hepatic acinus defines three functional zones

Zone 1 is closest to portal-tract blood supply.

Zone 2 is intermediate along the sinusoidal pathway.

Zone 3 lies farthest downstream, adjacent to the terminal hepatic venule.

Zonal distribution follows perfusion and hepatocyte metabolic specialization.

Zone 1

Near portal blood

Zone 2

Intermediate

Zone 3

Near central vein

Portal tract

Central vein

Blood flow

Slide 9 · Zone 3 normally receives less oxygen

Along the sinusoidal path, oxygen availability declines toward the central vein.

Zone 1 is relatively well oxygenated; Zone 3 has the lowest oxygenation.

Zone 3 therefore becomes particularly susceptible to reduced perfusion.

This gradient explains selective pericentral injury in circulatory failure.

Zone 1

Near portal blood

Zone 2

Intermediate

Zone 3

Near central vein

Portal tract

Central vein

Blood flow

Relative oxygenation decreases downstream

Slide 10 · Passive congestion is not active hyperemia

Property

Hyperemia

Passive congestion

Primary event

Increased arteriolar inflow

Reduced venous outflow

Hemodynamics

Active

Passive

Typical color

Red

Dusky blue-red

Late sequelae

Depend on cause

Hypoxia and scarring

Slide 11 · Venous backpressure dilates hepatic sinusoids

Impeded outflow increases venous and sinusoidal blood retention.

Centrilobular sinusoids and the central-vein region become engorged.

Congestion is most prominent near the venous drainage endpoint.

Sinusoidal widening compresses and separates neighboring hepatocyte plates.

Impaired venous return

Raised hepatic venous pressure

Dilated zone 3 sinusoids

Hepatocyte compression

Slide 12 · Right-sided cardiac decompensation is the prototypic cause

Right-sided cardiac failure raises systemic venous pressure.

Hepatic venous drainage becomes impeded without a necessary hepatic-vein thrombus.

Passive blood accumulation develops within centrilobular sinusoids.

Cardiac status is therefore essential context for hepatic congestion.

Right heart

Inferior vena cava

Hepatic veins

Central veins

Slide 13 · Gross appearance in early passive congestion

The liver is slightly enlarged, with a tense capsule.

Rounded hepatic margins reflect enlargement.

A cyanotic hue reflects accumulation of poorly oxygenated blood.

Gross congestion does not alone establish hepatocyte necrosis.

Slight enlargement · tense capsule · cyanotic color

Passive venous engorgement

No required necrosis

Slide 14 · Microscopic signature: Sinusoidal dilation

Dilated sinusoids contain excess blood, especially in zone 3.

The pericentral area is darker and more blood-filled than adjacent regions.

Congestion affects vascular spaces before extensive hepatocyte destruction.

Identify the central vein before assigning the lesion to zone 3.

Schematic hepatocyte plates and sinusoidal spaces

Portal side

Central-vein side

Slide 15 · Sustained congestion attenuates hepatocyte plates

Prolonged venous stasis is associated with centrilobular hepatocyte atrophy.

Hepatocytes become thinner; Adjacent cell plates are markedly attenuated.

An atrophic plate is not equivalent to a focus of coagulative necrosis.

The structural finding reflects a chronic pressure and oxygenation burden.

Schematic hepatocyte plates and sinusoidal spaces

Portal side

Central-vein side

Slide 16 · Congestion evolves with intensity and duration

Early changes emphasize central venous and sinusoidal engorgement.

Persistence leads to atrophy and loss of centrilobular hepatocytes.

Superimposed perfusion failure intensifies hypoxic damage.

Long-standing severe disease may culminate in pericellular fibrosis.

Dilation and stasis

Cell plate atrophy

Hemorrhagic injury

Fibrosis if sustained

Slide 17 · Left-sided failure may impair hepatic perfusion

Left-sided cardiac failure can reduce effective hepatic blood delivery.

Systemic shock similarly decreases tissue perfusion.

Pericentral hepatocytes lie at the downstream end of sinusoidal blood flow.

Reduced oxygen delivery preferentially injures this vulnerable region.

Reduced cardiac output

Reduced hepatic perfusion

Zone 3 hypoxia

Cell injury

Slide 18 · Shock produces a global oxygen-delivery problem

Shock compromises circulatory perfusion beyond an isolated hepatic vein.

Oxygen delivery declines along the entire hepatic microcirculation.

Because zone 3 starts with the least oxygen reserve, it is injured first.

The expected pattern is pericentral hepatocyte necrosis with periportal preservation.

Zone 1

Near portal blood

Zone 2

Intermediate

Zone 3

Near central vein

Portal tract

Central vein

Blood flow

Shock reduces incoming oxygen delivery

Slide 19 · Congestion and hypoperfusion can reinforce each other

Venous stasis impedes blood transit and sustains local deoxygenation.

Low systemic perfusion reduces incoming oxygen delivery.

Together, these effects increase susceptibility to cell death.

Synergistic centrilobular hemorrhagic necrosis.

Raised venous pressure

Reduced arterial/portal delivery

Zone 3 hypoxia

Hemorrhagic necrosis

Slide 20 · How centrilobular hepatocytes undergo necrosis

An inadequate oxygen supply impairs energy-dependent hepatocyte function.

Progressive ischemic injury causes pericentral cell death.

Hepatocyte loss becomes recognizable around central veins.

The lesion is geographically zonal rather than necessarily panlobular.

Schematic hepatocyte plates and sinusoidal spaces

Portal side

Central-vein side

Slide 21 · Why the necrotic region may be hemorrhagic

Backed-up or damaged centrilobular sinusoids are filled with red cells.

Hemorrhage and blood suffusion may accompany hepatocyte loss.

The combined lesion produces dark red pericentral regions.

Hemorrhage must be interpreted alongside hepatocyte viability.

Schematic hepatocyte plates and sinusoidal spaces

Portal side

Central-vein side

Slide 22 · Periportal hepatocytes are relatively preserved

Zone 1 is closest to branches of the hepatic artery and portal vein.

Its better oxygenation confers relative resistance to hypoperfusion.

Microscopy may show a sharp border between viable periportal cells and zone 3 loss.

Relative preservation does not imply that periportal injury is impossible.

Zone 1

Near portal blood

Zone 2

Intermediate

Zone 3

Near central vein

Portal tract

Central vein

Blood flow

Slide 23 · Nutmeg liver is a zonal macroscopic pattern

The cut surface may appear mottled or variegated.

Dark red-brown regions reflect centrilobular congestion, hemorrhage, and necrosis.

Paler intervening regions represent relatively spared parenchyma.

The name describes an appearance, not an independent etiology.

Dark: Zone 3 congestion / injury

Schematic cut-surface pattern — not a specimen

Slide 24 · Translate the gross pattern into histology

Dark centrilobular foci correspond to congested or hemorrhagic zone 3.

Paler areas correspond to comparatively preserved portal-adjacent liver.

Microscopic examination identifies whether hepatocytes are atrophic or necrotic.

Gross appearance alone cannot grade the cellular injury.

Dark pericentral gross foci

Blood-filled zone 3 sinusoids

Atrophy or necrosis: Assess microscopy

Slide 25 · Acute congestion versus advanced injury

Pattern

Predominant lesion

Context

Early passive congestion

Central-vein / sinusoidal dilation

Raised venous pressure

Atrophic congestion

Thin pericentral cell plates

Persistence

Hemorrhagic necrosis

Zone 3 cell death + red cells

Severe hypoxia

Cardiac sclerosis

Pericellular ± bridging fibrosis

Chronic severe failure

Slide 26 · Find the central vein on a liver section

The central vein receives sinusoidal blood from surrounding liver plates.

It normally lacks the full portal-tract triad grouping.

Pericentral red-cell accumulation maps outward from this vessel.

Misidentifying the central vein may reverse the apparent injury zone.

Central vein

Zone 3: Surrounding central vein

Slide 27 · Find the portal tract before labeling zone 1

Portal tracts contain paired arterial and portal venous branches and bile ducts.

They reside toward the classic lobule periphery.

Periportal plates are usually relatively viable in centrilobular ischemia.

Mapping both portal tract and central vein makes a zonal diagnosis reliable.

Central vein

Portal tracts at periphery

Slide 28 · Red-cell suffusion is not the same as necrosis

Observation

Represents

Not sufficient alone for

Sinusoids packed with RBCs

Congestion

Necrosis

RBCs between damaged plates

Hemorrhagic suffusion

Specific etiology

Hepatocyte loss / necrosis

Parenchymal damage

Cause without context

Slide 29 · Atrophy and hepatocyte dropout differ

Feature

Atrophy

Necrosis / dropout

Hepatocytes

Present but shrunken

Lost or nonviable

Plate pattern

Attenuated

Interrupted or absent

Implication

Chronic stress

Cell death

May coexist with

Congestion

Hemorrhage

Slide 30 · Hemosiderin-laden macrophages mark prior hemorrhage

Chronic congestion may be accompanied by capillary injury and local hemorrhage.

Breakdown of extravasated erythrocytes can leave hemosiderin in macrophages.

These macrophages indicate prior red-cell extravasation, not a unique cause.

Interpret them with the distribution of congestion and hepatocyte injury.

Red-cell leakage

Erythrocyte breakdown

Hemosiderin accumulation

Macrophages in lesion

Slide 31 · Periportal fatty change can accompany hypoxic injury

Zone 1 hepatocytes may show fatty change while zone 3 undergoes ischemic necrosis.

The pattern reflects different zonal responses to circulatory stress.

Fat accumulation is not synonymous with necrosis.

Use the combination of findings, rather than one component, for interpretation.

Zone 1

Near portal blood

Zone 2

Intermediate

Zone 3

Near central vein

Portal tract

Central vein

Blood flow

Slide 32 · Read a congested liver section systematically

Locate both central vein and portal tract.

Evaluate sinusoidal dilation, red-cell accumulation, and bleeding.

Assess pericentral hepatocyte atrophy, necrosis, or dropout.

Look for pericellular fibrosis and extension toward other zones.

Locate landmarks

Evaluate vascular spaces

Assess hepatocytes

Inspect fibrosis

Slide 33 · Cardiac sclerosis: Chronic severe venous injury

Sustained severe congestive heart failure can produce hepatic fibrotic remodeling.

The initial pattern is described as centrilobular pericellular fibrosis.

Bridging fibrous septa may develop in advanced examples.

Not every congested liver has cardiac sclerosis.

Chronic heart failure

Recurrent zone 3 stress

Pericellular fibrosis

Possible bridging

Slide 34 · Pericellular fibrosis begins near central veins

The collagen accumulates around affected centrilobular hepatocytes.

This is distinct from beginning the diagnosis with a portal-based scar.

Distribution reflects the vascular locus of chronic injury.

A collagen stain can help demonstrate fibrous expansion when tissue is available.

Pericentral hepatocyte plates

Central

Vein

Pericellular collagen near zone 3

Schematic — not a histologic specimen

Slide 35 · Bridging fibrosis represents more extensive remodeling

Chronic severe congestion may progress beyond local pericellular fibrosis.

Fibrous septa can bridge regions of injury.

Fibrosis is an endpoint of persistent damage, not an inevitable feature of acute stasis.

Recognize distribution before attributing scar to a specific vascular disorder.

Pericentral hepatocyte plates

Central

Vein

Bridging collagen between injured areas

Schematic — not a histologic specimen

Slide 36 · Cardiac sclerosis is a pattern, not proof of mechanism

The zonal scar supports a chronic venous-hemodynamic contribution.

Historical cardiac disease and contemporaneous congestion strengthen attribution.

Fibrosis alone does not identify the exact cardiac lesion.

Interpret associated liver diseases before assigning all scarring to congestion.

Histologic pattern

Clinical cardiac context

Competing injuries

Integrated interpretation

Slide 37 · Outflow abnormalities occur at different levels

Systemic right-heart failure impedes hepatic venous return.

Budd–Chiari syndrome is associated with obstruction of major hepatic veins.

Sinusoidal obstruction syndrome targets terminal venules and sinusoids.

All may create centrilobular injury, but mechanisms are different.

Systemic right heart

Major hepatic veins

Terminal venules / sinusoids

Slide 38 · Budd–Chiari syndrome can resemble congestion

Feature

Budd–Chiari syndrome

Passive cardiac congestion

Primary defect

Major hepatic-vein thrombosis

Systemic venous backpressure

Zone 3 lesion

Congestion and necrosis

Congestion ± necrosis

Distinguishing context

Hepatic venous thrombosis

Right-heart decompensation

Slide 39 · Sinusoidal obstruction syndrome has an endothelial lesion

Toxic endothelial injury damages sinusoidal and terminal venular lining.

Obstructive debris and progressive venular fibrosis limit hepatic outflow.

Acute lesions can include centrilobular congestion and necrosis.

The cause and venular pathology differ from uncomplicated cardiac congestion.

Endothelial injury

Sinusoidal/venular obstruction

Pericentral congestion

Hepatocyte injury

Slide 40 · Compare three causes of pericentral congestion

Condition

Dominant disturbance

Useful discriminator

Cardiac congestion

Systemic venous pressure

Right-heart dysfunction

Budd–Chiari

Major hepatic vein obstruction

Large hepatic-vein thrombi

Sinusoidal obstruction

Sinusoidal/terminal venular injury

Obliterative small-vein changes

Slide 41 · Do not confuse inflow ischemia with venous congestion

Dimension

Inflow reduction

Outflow congestion

Hemodynamic event

Reduced delivery

Impeded drainage

Morphologic emphasis

Ischemic injury

Dilated blood-filled sinusoids

Possible overlap

Hypoxia

Secondary hypoxia / necrosis

Slide 42 · Clinical expression may be limited

The liver has substantial functional reserve.

Circulatory lesions may be evident morphologically before marked clinical hepatic failure.

Transient serum aminotransferase elevation may be the only clinical evidence.

Assessment must consider underlying systemic hemodynamics.

Morphology can exceed clinical symptoms

Large functional reserve

Systemic context is essential

Slide 43 · Aminotransferases reflect hepatocellular damage

Transient aminotransferase elevation in many cases.

Aminotransferase release signals hepatocyte injury, not its etiology.

A circulatory history and zone 3 pattern make hypoxic-congestive injury plausible.

No single liver enzyme result demonstrates a nutmeg pattern.

Hypoxic injury

Hepatocyte damage

Enzyme release

Transient serum elevation

Slide 44 · Jaundice is possible with greater parenchymal injury

Injury may be sufficient to induce mild to moderate jaundice.

The clinical expression depends on the extent of parenchymal dysfunction.

Jaundice alone does not establish a circulatory mechanism.

Interpret alongside hepatic morphology and the cardiac/shock history.

Larger zone 3 injury

Impaired hepatic function

Serum bilirubin increase

Clinical jaundice

Slide 45 · Hepatic reserve explains clinicopathologic mismatch

The liver may tolerate modest injury without overt dysfunction.

Gross and microscopic venous congestion may be conspicuous.

Laboratory abnormalities can be transient or limited.

Absence of marked jaundice does not exclude a congestive pattern.

Morphology

Clinical findings

The severity of congestion or zonal damage need not parallel obvious symptoms.

Slide 46 · Correlate the liver with right-sided heart disease

Venous-pressure elevation provides a mechanism for sinusoidal engorgement.

A mildly enlarged, cyanotic liver supports congestive involvement.

Zone 3 atrophy or chronic fibrosis suggests persistence.

Exclude a major hepatic-vein obstruction when the clinical scenario warrants.

Right-heart state

Venous backpressure

Pericentral congestion

Assess chronicity

Slide 47 · Correlate abrupt necrosis with systemic hypoperfusion

Acute circulatory failure can reduce hepatic oxygen delivery.

Zone 3 necrosis is compatible with its low baseline oxygenation.

Coexisting venous congestion increases susceptibility.

Interpret the lesion as part of multisystem hemodynamic compromise.

Shock / low output

Reduced oxygen delivery

Zone 3 necrosis

Clinical correlation

Slide 48 · Macroscopic teaching exercise: Map the colors

A dark centrilobular region indicates a blood-rich zone in this schematic.

The intervening pale region represents comparatively preserved parenchyma.

Multiple repeated lobules create the mottled cut-surface pattern.

Actual necrosis must be assessed histologically, not from the pattern alone.

Dark: Zone 3 congestion / injury

Schematic cut-surface pattern — not a specimen

Slide 49 · A focused interpretation workflow

Start with systemic clinical context: Failure, shock, or outflow obstruction.

Locate the lesion relative to portal tracts and central veins.

Classify predominant change as congestion, atrophy, necrosis, or fibrosis.

Check for a competing vascular or parenchymal disorder before concluding.

Clinical setting

Zonal distribution

Dominant morphology

Alternative causes

Slide 50 · Autopsy context: Avoid overstating significance

Finding

Possible interpretation

Necessary context

Engorged sinusoids

Terminal or chronic stasis

Clinical time course

Zone 3 necrosis

Recent circulatory compromise

Shock / cardiac data

Zone 3 fibrosis

Prolonged injury

Chronic hemodynamics

Slide 51 · Three avoidable diagnostic errors

Equating blood-filled sinusoids with hepatocellular necrosis.

Calling any mottled liver a distinct primary hepatic disease.

Attributing centrilobular fibrosis to heart failure without context.

Overlooking Budd–Chiari or sinusoidal obstruction when suggested by findings.

Congestion ≠ necrosis

Nutmeg ≠ etiology

Fibrosis ≠ proof of heart failure

Slide 52 · Case 1: Long-standing right-heart dysfunction

A patient with chronic right-sided cardiac decompensation has an enlarged cyanotic liver.

Histology shows dilated pericentral sinusoids and thin hepatocyte plates.

No substantial centrilobular necrosis is apparent.

What is the dominant lesion and why does it occur?

Dominant process?

Slide 53 · Case 1: Explain the observed pattern

The raised right-heart venous pressure impairs hepatic outflow.

Central-vein and zone 3 sinusoids fill with excess blood.

Prolonged congestion attenuates neighboring hepatocyte plates.

The absence of conspicuous necrosis does not negate chronic congestion.

Right-heart dysfunction

Hepatic venous stasis

Dilated sinusoids

Zone 3 atrophy

Slide 54 · Case 2: Circulatory shock

Following profound systemic circulatory failure, a liver section has cell loss around central veins.

Periportal hepatocytes remain viable, with local hemorrhagic suffusion.

The clinician asks why the pattern is selectively centrilobular.

What zonal property explains the distribution?

Why zone 3?

Slide 55 · Case 2: Explain selective zone 3 necrosis

The acinar oxygen gradient places zone 3 at the lowest oxygen availability.

Shock reduces upstream oxygen delivery.

Pericentral cell death and hemorrhage follow severe hypoxic injury.

Zone 1 is relatively spared because of proximity to incoming blood.

Zone 1

Near portal blood

Zone 2

Intermediate

Zone 3

Near central vein

Portal tract

Central vein

Blood flow

Shock reduces incoming oxygen delivery

Slide 56 · Case 3: Pericentral congestion with venular injury

A patient after hematopoietic stem cell transplantation develops hepatic dysfunction.

Tissue shows centrilobular congestion with obliterative terminal-venule changes.

The microscopic findings overlap with cardiac congestive injury.

Which vascular mechanism requires special consideration?

Competing diagnosis?

Slide 57 · Case 3: Locate the decisive pathologic feature

Sinusoidal obstruction syndrome begins with toxic endothelial injury.

Terminal hepatic venules can be narrowed or obliterated.

Pericentral congestion and necrosis are downstream consequences.

The obstructive venular lesion distinguishes it from uncomplicated systemic backpressure.

Endothelial toxicity

Venular lumen injury

Sinusoidal obstruction

Zone 3 damage

Slide 58 · Integrate mechanisms, morphology, and clinical setting

Backpressure predominantly causes centrilobular sinusoidal congestion.

Hypoperfusion preferentially produces zone 3 necrosis.

Both together can yield hemorrhagic necrosis and a nutmeg pattern.

Persistent severe congestion may progress to cardiac sclerosis.

Backpressure

Sinusoidal congestion

Poor perfusion

Zone 3 necrosis

Prolonged severe stress

Cardiac sclerosis

Slide 59 · References and visual provenance

Robbins, Cotran & Kumar. Pathologic Basis of Disease. 11th ed. Chapter 18, pp. 749–750 and 783–786.

Robbins, Cotran & Kumar. Pathologic Basis of Disease. 11th ed. Chapter 4, p. 102.

Diagrams in this presentation are original editable PowerPoint schematics, not patient images.

Diagrams illustrate anatomical and pathologic relationships; they are not diagnostic tissue images.