Chronic or Healed Pericarditis

Slide 1 · Chronic or Healed Pericarditis

Morphology, mechanical consequences, and clinicopathologic interpretation

Anatomical pathology • clinician-oriented teaching

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · Learning goals

Distinguish innocuous healed adhesions from hemodynamically important fibrosis.

Explain how mediastinal tethering changes systolic motion and workload.

Relate fibrocalcific encasement to limited diastolic filling.

Connect gross morphology with clinical signs and pericardiectomy.

Slide 3 · Pericardial disease: The major pathologic processes

Fluid accumulation changes the mechanical environment around the heart.

Inflammation can resolve or become organized into fibrous tissue.

Dense fibrous constriction is a distinct, potentially serious endpoint.

A combination of fluid, inflammation, and fibrosis can occur.

Sliding serosal layers

Simplified cross-sectional schematic

Slide 4 · The pericardial cavity is normally a potential space

Visceral and parietal serosal surfaces define the pericardial sac.

The intervening virtual space permits relative movement of the layers.

Scarring may bridge the layers without necessarily blocking filling.

The mechanical effect depends on the configuration of the scar.

Sliding serosal layers

Simplified cross-sectional schematic

Slide 5 · Resolution versus organization of pericardial inflammation

Pericardial inflammation

Organization of exudate

Fibrous repair

Adhesions or constriction

Repair may leave only small plaques, or may produce an extensive mechanical constraint.

Conceptual sequence; Timing and scale not implied

Slide 6 · Plaque-like fibrous thickening: “soldier’s plaque”

A localized plaque is a healed fibrous alteration of the serosa.

The gross lesion may be unobtrusive despite an inflammatory history.

It is generally not associated with important cardiac impairment.

This illustrates that visible fibrosis does not always mean constriction.

Localized fibrous plaque

Simplified cross-sectional schematic

Slide 7 · Delicate fibrous adhesions are usually innocuous

Thin adhesions may form between pericardial serosal surfaces.

The bridges represent organization rather than active exudation.

Most do not appreciably impair cardiac function.

Recognition of the lesion requires separation of form from effect.

Delicate bridging adhesions

Simplified cross-sectional schematic

Slide 8 · Mesh-like adhesions may obliterate the potential space

Stringy strands can occupy much of the virtual pericardial cavity.

The source calls this pattern adhesive pericarditis.

Even substantial adhesions usually leave cardiac function intact.

Obliteration alone is therefore not equivalent to constriction.

Mesh-like adhesions

Simplified cross-sectional schematic

Slide 9 · Healed lesions: Morphology and usual consequence

Pattern

Pathologic appearance

Functional implication

Localized plaque

Discrete fibrous serosal thickening

Usually negligible

Delicate adhesions

Fine bridging fibrous strands

Rarely significant

Adhesive pericarditis

Mesh-like fibrous strands; Space may disappear

Most often no functional effect

Slide 10 · The critical distinction is mechanical

The same reparative process can have very different consequences

Limited plaque

A localized change with little interference in cardiac motion.

Adhesive fusion

Serosal bridges can eliminate the space without major dysfunction.

Rigid encasement

A continuous scar shell can impede ventricular expansion.

Slide 11 · A reparative lesion is not necessarily a constricting lesion

Inflammatory injury

Fibrous organization

Evaluate scar arrangement

Assess cardiac consequence

Thickness, continuity, and attachment determine the interpretation more than the mere presence of fibrosis.

Conceptual sequence; Timing and scale not implied

Slide 12 · Earlier inflammation can leave a late fibrous endpoint

The healed lesion may be seen after the active inflammatory phase.

Organized inflammation is the common pathologic substrate.

The source does not require a clinically recognized antecedent episode.

A chronic morphology cannot itself date the inflammatory event.

Slide 13 · Pericarditis causes in the parent section

Group

Examples noted by Robbins

Infectious

Viruses, pyogenic bacteria, tuberculosis, fungi, parasites

Immune-mediated

Rheumatic fever, systemic lupus erythematosus, postcardiotomy, Dressler syndrome

Other

Uremia, infarction, cardiac surgery, tumors, trauma, radiation

Slide 14 · Suppurative inflammation can heal by scarring

Purulent pericarditis is an active microbial infection of the sac.

The inflammatory exudate and subsequent tissue injury may be marked.

Complete resolution is infrequent in the source description.

Organization and scarring commonly follow; Constriction can result.

Slide 15 · Suppurative pericarditis: From infection to fibrosis

Microbial invasion

Purulent exudate

Scarring during repair

Potential constriction

A severe inflammatory antecedent can plausibly explain a later dense scar shell.

Conceptual sequence; Timing and scale not implied

Slide 16 · Tuberculous pericarditis: A relevant antecedent

Tuberculosis appears among infectious causes of pericarditis.

The source notes that tuberculous involvement may show caseation.

Healed pericardial fibrosis may follow inflammatory injury.

Caseation is an inflammatory clue, not a requirement for a healed scar.

Slide 17 · Previous cardiac surgery can precede adhesions

Cardiac surgery is listed among causes of pericardial inflammation.

A fibrinous reaction may follow routine cardiac operations.

Adhesive mediastinopericarditis can follow previous surgery.

A postsurgical history helps explain external pericardial attachments.

Slide 18 · Mediastinal radiation can cause chronic pericardial damage

Mediastinal irradiation is a stated antecedent of adhesive mediastinopericarditis.

Radiation can induce pericarditis, fluid accumulation, and chronic disorders.

The mechanism becomes important when repaired tissues adhere externally.

The relevant exposure history may precede the presentation.

Slide 19 · Antecedent clues and the resulting pathology

Antecedent history

Source-supported later concern

Prior infectious pericarditis

Adhesive mediastinopericarditis; Scarring after severe infection

Prior cardiac surgery

Fibrinous reaction and external adhesion

Mediastinal irradiation

Pericardial inflammation, effusion, chronic adhesive disease

No recalled pericarditis

Still compatible with constrictive pericarditis

Slide 20 · Adhesive mediastinopericarditis is external tethering

The pericardial sac is obliterated by fibrous adhesion.

The outer aspect of the parietal layer attaches to nearby structures.

The scar restricts motion through mechanical tethering.

This pattern is not simply a thick inner pericardial shell.

External fibrous attachments

Simplified cross-sectional schematic

Slide 21 · The site of adhesion determines the mechanical problem

Internal adhesions connect pericardial serosal surfaces.

External adhesions bind the parietal pericardium to the mediastinum.

The contracting heart must move tissues attached to the sac.

External connections explain characteristic systolic findings.

External fibrous attachments

Simplified cross-sectional schematic

Slide 22 · Adhesive mediastinopericarditis: Systolic mechanism

External pericardial adhesion

Ventricular contraction

Traction on surrounding tissues

Increased workload

Mechanical work is expended against the attachments, not just to eject blood.

Conceptual sequence; Timing and scale not implied

Slide 23 · Normal versus externally tethered systole

Feature

Untethered heart

External pericardial adhesions

Motion

Contraction without fibrous mediastinal coupling

Contraction pulls adjacent structures

Mechanical burden

No scar-related external traction

Additional work against attachments

Visible effects

No scar-induced chest retraction

Rib cage or diaphragm may retract

Slide 24 · Systolic rib-cage retraction reflects traction

The heart contracts while tethered to adjacent thoracic structures.

Systolic traction can produce rib-cage retraction.

This is a mechanical manifestation of mediastinal adhesions.

The finding is possible, not obligatory, account.

External fibrous attachments

Simplified cross-sectional schematic

Slide 25 · Systolic diaphragmatic retraction has the same basis

The diaphragm may be linked mechanically to the adhered pericardium.

Each systole can transmit movement into the diaphragm.

This finding points to external attachment and abnormal traction.

Absence of visible retraction does not disprove healed adhesions.

External fibrous attachments

Simplified cross-sectional schematic

Slide 26 · Pulsus paradoxus may accompany tethered disease

Pulsus paradoxus among possible findings.

It is presented as an observed clinical phenomenon, not a universal sign.

It should be interpreted with other physical and pathologic features.

The textbook excerpt does not assign a numerical threshold here.

External fibrous attachments

Simplified cross-sectional schematic

Slide 27 · External traction can increase cardiac workload

Each systolic contraction acts against attached surrounding tissue.

The mechanical demand is added to the usual ejection task.

Sustained increased workload may prompt cardiac remodeling.

The source describes hypertrophy and dilation in some cases.

External fibrous attachments

Simplified cross-sectional schematic

Slide 28 · Hypertrophy in adhesive mediastinopericarditis

Systolic tethering increases external mechanical load.

Significant myocardial hypertrophy may occasionally develop.

This is remodeling in response to the workload, not the scar itself.

Hypertrophy is not claimed to occur in every adhesive case.

External fibrous attachments

Simplified cross-sectional schematic

Slide 29 · Dilation is also possible with external adhesions

Some hearts develop dilation in addition to hypertrophy.

The pericardium is attached externally rather than forming a rigid shell.

This distinguishes it from classic fully constrictive pericarditis.

The difference is a useful gross-pathologic discriminator.

External fibrous attachments

Simplified cross-sectional schematic

Slide 30 · Adhesive mediastinopericarditis: One causal unit

The defining event is abnormal systolic coupling of the heart to the mediastinum

Anatomic substrate

Obliterated sac with external fibrous attachments.

Mechanical effect

Systolic traction on rib cage and diaphragm; Added workload.

Possible consequence

Hypertrophy and dilation; Pulsus paradoxus may be observed.

Slide 31 · Constrictive pericarditis is an enclosing scar

The heart is encased within dense fibrous or fibrocalcific tissue.

The scar limits diastolic expansion rather than merely tethering systole.

Ventricular filling is restricted, with consequences for cardiac output.

An identifiable previous attack of pericarditis is not required.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 32 · The mechanical sequence of constriction

Dense pericardial scar

Restricted diastolic expansion

Limited ventricular filling

Reduced output reserve

The enclosing scar imposes an external ceiling on the heart’s ability to expand.

Conceptual sequence; Timing and scale not implied

Slide 33 · Gross morphology: A dense circumferential shell

The defining tissue is an enclosing fibrous scar.

It may largely or completely eliminate the normal pericardial space.

The encasement is more important than isolated thin adhesions.

At severe extremes, the scar resembles a fitted mold.

Thickened fibrous scar

Simplified cross-sectional schematic

Slide 34 · The fibrous scar may be remarkably thick

Scar thickness reaching as much as 1 cm.

This is an upper descriptive value, not a diagnostic cutoff.

The fibrous tissue may surround the heart extensively.

Thickness must be interpreted with distribution and mechanical effect.

Thickened fibrous scar

Simplified cross-sectional schematic

Slide 35 · Fibrocalcific pericardial scarring

The constricting shell can include fibrous tissue and calcification.

Calcification is an additional gross characteristic in some cases.

The source does not require calcification for constrictive disease.

A rigid enclosing scar is the critical functional lesion.

Fibrocalcific shell

Simplified cross-sectional schematic

Slide 36 · Concretio cordis: The plaster-mold appearance

Severe fibrocalcific encasement may resemble a plaster cast.

This extreme configuration is termed concretio cordis.

The scar closely surrounds the heart and impedes expansion.

The term is a gross description, not a distinct etiology.

Dense plaster-mold scar

Simplified cross-sectional schematic

Slide 37 · Obliteration of the pericardial space has two meanings

Mesh-like adhesions can erase the space with little functional effect.

Constrictive scar can also obliterate the space.

In constriction, the scar creates a stiff circumferential boundary.

Both morphology and function are needed for correct interpretation.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 38 · Adhesions are not synonymous with constriction

Observation

Adhesive pericarditis

Constrictive pericarditis

Main scar pattern

Fibrous bridges, potentially extensive

Dense enclosing scar shell

Pericardial space

Can be obliterated

Usually obliterated by scar

Mechanical result

Often no impairment

Limited diastolic expansion

Typical consequence

Usually clinically silent

Reduced filling and output reserve

Slide 39 · Diastolic expansion is limited by the scar

Ventricles must expand during filling.

The dense pericardial shell resists outward expansion.

Filling is therefore externally constrained despite cardiac contraction.

The result is impaired capacity to augment forward output.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 40 · Constrictive physiology: Filling, not force generation

Rigid shell

Reduced expansion during diastole

Restricted filling volume

Limited cardiac output

The primary lesion lies outside the myocardium, although clinical signs resemble myocardial restriction.

Conceptual sequence; Timing and scale not implied

Slide 41 · Resting output may already be reduced

Constrictive pericarditis can lower cardiac output at rest.

Resting measurements do not capture the full functional problem.

The scar also restricts the normal ability to respond to demand.

Clinical burden is therefore partly a failure of physiologic reserve.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 42 · Loss of cardiac-output reserve is particularly important

Systemic demands require an increase in cardiac output.

Rigid encasement prevents the heart from expanding adequately.

The source emphasizes little or no capacity to augment output.

Reduced reserve explains disproportionate limitation on exertion.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 43 · Resting versus increased systemic demand

Situation

What constriction permits

Teaching implication

Rest

Cardiac output may be low

Variable severity at baseline

Greater demand

Little or no increase in output

Major limitation in functional reserve

Slide 44 · Why hypertrophy and dilation are absent in constriction

A dense scar shell tightly encloses the heart.

Hypertrophy and dilation cannot occur in this setting.

This contrasts with the occasional remodeling of externally tethered hearts.

The two diagnoses have fundamentally different mechanical boundaries.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 45 · External tethering versus rigid encasement

Distinction

Mediastinopericarditis

Constrictive pericarditis

Principal restriction

Systolic movement against external structures

Diastolic expansion within a fixed scar

Workload

Can increase during contraction

Filling capacity is limited

Remodeling

Hypertrophy/dilation may occur

Prevented by the dense shell (Robbins)

Gross key

External parietal attachments

Enclosing fibrous/fibrocalcific scar

Slide 46 · Constrictive disease can mimic restrictive cardiomyopathy

Both can produce impaired filling and reduced cardiac output.

Constrictive pericarditis is a disease of the external covering.

Restrictive cardiomyopathy involves stiff, noncompliant myocardium.

The tissue compartment causing stiffness is the discriminating concept.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 47 · Constrictive pericarditis versus restrictive cardiomyopathy

Feature

Constrictive pericarditis

Restrictive cardiomyopathy

Site of lesion

Pericardial fibrous shell

Myocardial tissue

Structural basis

External encasement

Infiltration, fibrosis, or endomyocardial scar

Major problem

Restricted diastolic expansion

Noncompliant ventricular muscle

Clinical overlap

Restricted filling / low output

Restricted filling / low output

Slide 48 · A prior clinical episode may be absent

Robbins explicitly allows constriction with or without known pericarditis.

The current gross lesion does not require a documented earlier diagnosis.

The anatomic scar may be the dominant evidence of the process.

Do not exclude constriction simply because the history is incomplete.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 49 · Distant or muffled heart sounds

Attenuated heart sounds are listed among signs of constriction.

They should be interpreted alongside venous and systemic findings.

The sign is supportive rather than pathognomonic.

The relevant substrate is chronic pericardial encasement.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 50 · Elevated jugular venous pressure

Elevated jugular venous pressure is a stated clinical feature.

The rigid pericardial envelope limits cardiac filling.

This leads to the clinical picture of systemic venous congestion.

The clinical observation and external scar are linked mechanistically.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 51 · Peripheral edema in constrictive disease

Peripheral edema is another sign.

Restricted cardiac filling accompanies impaired venous return handling.

Edema is part of a broader congestive presentation.

It should not be treated as specific for pericardial constriction.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 52 · Clinical clues reflect the underlying encasement

Read each clinical sign together with the gross and physiologic lesion

Muffled sounds

A recognized physical finding with a diseased pericardium.

Elevated JVP

A venous-pressure clue in impaired filling.

Peripheral edema

A systemic manifestation of congestion.

Slide 53 · Three pathologic patterns at the bedside

Pattern

Primary mechanics

Expected effect

Simple healed adhesions

Fibrous attachments within sac

Usually no functional impairment

Adhesive mediastinopericarditis

External systolic tethering

Possible retraction, pulsus paradoxus, remodeling

Constrictive pericarditis

Dense shell limits diastolic expansion

Low output reserve, JVP elevation, edema

Slide 54 · Reasoning from a chronic gross specimen

Describe distribution

Identify external adhesions

Look for an enclosing shell

Predict physiologic consequence

Morphology becomes clinically useful when a specific motion or filling mechanism is identified.

Conceptual sequence; Timing and scale not implied

Slide 55 · Pericardiectomy addresses the mechanical lesion

Surgical resection of the constricting shell.

The operation is termed pericardiectomy.

The rationale is removal of the rigid barrier to diastolic expansion.

The statement concerns constrictive disease, not every healed adhesion.

Constraining fibrous shell

Simplified cross-sectional schematic

Slide 56 · The pathological target of pericardiectomy

Scar encases heart

Scar restricts diastole

Fibrous shell is resected

External constraint is relieved

The surgical target is the pathologic pericardium, not an intrinsic cardiomyopathy.

Conceptual sequence; Timing and scale not implied

Slide 57 · Case 1: A gross finding without clinical impairment

A heart examined after death has several small, white plaque-like thickenings on the serosa. No ante-mortem cardiac dysfunction is documented.

Diagnostic reasoning

What pattern of healed pericardial injury is represented?

Does fibrosis alone establish constrictive pericarditis?

Slide 58 · Case 1: Interpretation of plaque-like fibrosis

The pattern resembles the source-described “soldier’s plaque.”

Small plaque-like thickening can be an innocuous healed lesion.

No evidence here establishes a circumferential rigid shell.

The morphologic diagnosis should not imply unproven clinical constriction.

Localized fibrous plaque

Simplified cross-sectional schematic

Slide 59 · Case 2: A tethered heart after surgery

A patient with prior cardiac surgery has a largely obliterated sac and dense attachments from the parietal pericardium into adjacent mediastinal tissues. The rib cage retracts with systole.

Diagnostic reasoning

What process best explains the retraction?

Which phase of cardiac mechanics is directly strained?

Slide 60 · Case 2: Interpretation of external tethering

Adhesive mediastinopericarditis explains external attachments.

The contracting heart pulls against adherent surrounding tissues.

Systolic retraction is concordant with the described mechanism.

Hypertrophy or dilation may occur from increased workload.

External fibrous attachments

Simplified cross-sectional schematic

Slide 61 · Case 3: A heart encased by a calcified shell

A patient has elevated jugular venous pressure, leg edema, and limited cardiac-output reserve. At operation, a thick fibrocalcific layer tightly envelops the heart.

Diagnostic reasoning

Identify the dominant pathologic lesion.

Explain the link between the shell and impaired output.

Slide 62 · Case 3: A mechanistic diagnosis of constriction

The enclosing fibrocalcific scar supports constrictive pericarditis.

The rigid shell limits diastolic expansion and ventricular filling.

Venous congestion and low output reserve fit the mechanism.

Pericardiectomy removes the constricting fibrous shell.

Fibrocalcific shell

Simplified cross-sectional schematic

Slide 63 · Final morphology–mechanics matrix

Lesion

Anatomic signature

Physiologic meaning

Soldier’s plaque

Discrete serosal fibrous thickening

Usually negligible

Adhesive pericarditis

Bridging/mesh-like fibrous adhesions

Usually negligible

Mediastinopericarditis

Parietal-to-mediastinal adhesions

Systolic tethering / excess workload

Constrictive pericarditis

Dense fibrous or fibrocalcific shell

Restricted diastolic expansion

Slide 64 · Three rules to retain

Morphologic recognition should always be connected to the relevant mechanical consequence

Fibrosis ≠ constriction

Plaques and adhesions may be clinically silent.

External tethering

Adhesions to surrounding tissues burden systole.

Rigid encasement

A dense shell limits filling and cardiac-output reserve.

Slide 65 · References and scope

Robbins, Cotran & Kumar: Pathologic Basis of Disease, 11th edition (2026).

Read the textbook sections on pericardial disease and its chronic healing patterns.

Core reading: “Chronic or Healed Pericarditis.”

All process figures are original editable schematics; not patient images.