On which heart valves and leaflet surfaces do vegetations localize in Libman-Sacks endocarditis?

In atypical verrucous Libman-Sacks endocarditis, vegetations localize predominantly on left-sided valves: the mitral valve is most commonly affected, followed less frequently by the aortic or tricuspid valves. A characteristic feature is the bilateral location of deposits, meaning involvement of both sides of the valve leaflets. Verrucous deposits form directly within areas of endocardial ulceration.

How does joint involvement in SLE morphologically differ from rheumatoid arthritis?

Systemic lupus erythematosus features a non-erosive synovitis without joint deformation. Microscopy reveals shedding of lining synoviocytes, sclerosed villi, vasculitis with fibrinoid necrosis of vessel walls, and perivascular infiltration.

What specifically composes hematoxylin bodies in lupus nephritis?

Hematoxylin bodies represent free-lying degraded nuclei.

What type of necrosis is characteristic of vasculitis during an SLE flare?

Fibrinoid necrosis develops in the vessel walls of the skin, joints, and other organs during systemic lupus erythematosus exacerbations.

What is the "wire loop" lesion?

It is the pathological thickening of the glomerular capillary basement membranes resulting from massive subendothelial immune complex deposition.

Does joint involvement in SLE lead to joint deformities?

No, systemic lupus erythematosus is characterized by non-erosive synovitis that occurs without joint deformation.

What is the primary cause of death in patients with SLE?

The most frequent severe outcome of the disease is acute or chronic renal failure with uremia in the setting of progressive lupus nephritis.

Home › Pathology › Visceral Manifestations of Systemic Lupus Erythematosus

Visceral Manifestations of Systemic Lupus Erythematosus

Nephritis lupica

For medical students2 min readUpdated 2026-10-10

Systemic lupus erythematosus (SLE) is characterized by multiorgan involvement resulting from the formation and deposition of immune complexes. Lupus nephritis plays a key role in the clinical picture and patient prognosis, consistently leading to renal failure.

KidneysLupus nephritis with the "wire loop" lesion

HeartLibman-Sacks non-bacterial verrucous endocarditis

Skin"Butterfly" malar rash

JointsNon-erosive synovitis without joint deformity

SpleenPathognomonic "onion skin" concentric periarterial fibrosis

Lupus Nephritis (Renal Involvement)

Renal involvement determines the severity of SLE. The pathogenesis is based on the formation of immune complexes (composed of DNA and anti-DNA antibodies) directly in situ. These complexes deposit in the mesangium and glomerular capillary basement membranes. The location of the deposits determines the specific clinico-morphological form of glomerulonephritis.

Macroscopic appearance: Kidneys are enlarged and mottled due to petechial hemorrhages.
Microscopic appearance: Specific nuclear pathology is revealed — hematoxylin bodies. The "wire loop" lesion is characteristic, representing marked thickening of the capillary basement membranes due to massive subendothelial deposits. Foci of fibrinoid necrosis and hyaline thrombi are also detected.
Electron microscopy: Virus-like inclusions are visualized within capillary endothelial cells.

In addition to glomeruli, tubulointerstitial changes develop in 50% of cases, caused by granular deposits in the tubular basement membrane.

Skin and Joint Changes

Skin involvement is a classic sign of SLE. The most well-known is the well-demarcated "butterfly" rash over the bridge of the nose and cheeks.

During exacerbation: Dermal edema, vasculitis with fibrinoid necrosis of vessel walls, and perivascular lymphomacryrophage infiltration are observed.
During remission: Dermal sclerosis, epidermal atrophy and hyperkeratosis, and vacuolization of basal layer cells develop. Involvement of hair follicles leads to alopecia.

Immunohistochemical staining shows immunoglobulin and complement deposits at the dermoepidermal junction.

Acute, subacute, or chronic synovitis occurs in the joints. Its key feature is a non-erosive nature: inflammation proceeds with shedding of lining synoviocytes and vasculitis, but without joint deformity. Sclerosed villi can be found in the tissue.

Cardiovascular System and Central Nervous System

The inflammatory process in SLE is generalized and affects vital organ systems:

Heart: Inflammation can involve all layers (pericarditis, myocarditis). Non-bacterial verrucous endocarditis (Libman-Sacks endocarditis) forms on the endocardium. Coronary atherosclerosis develops more frequently.
Blood vessels: Arteriolitis, capillaritis, and venulitis occur within the microvasculature. In large vessels (including the aorta), elastolysis and elastofibrosis are observed due to involvement of the vasa vasorum.
Central nervous system: Neurological symptoms are associated with the action of antiphospholipid, antineuronal, and anti-synaptic membrane antibodies. Morphologically, this manifests as productive or productive-destructive vasculitis, thrombosis without vasculitis, ischemic infarctions, hemorrhages, and neurocyte necrosis.

Spleen, Lungs, and Immune System

Spleen: Macroscopically enlarged. Microscopically, follicular hyperplasia and plasmacytic infiltration of the pulp are revealed. A specific sign is "onion skin" concentric periarterial fibrosis.
Lungs: Pleuritis is the most common manifestation. Lupus pneumonitis with lung parenchymal involvement and vasculitis develops less frequently, ultimately leading to interstitial fibrosis and pulmonary hypertension.
Lymphoid tissue: Large follicles with germinal centers appear in the thymus (within expanded perivascular spaces) and enlarged lymph nodes.

Mnemonic

To remember the characteristic microscopic findings of lupus nephritis, use the acronym W-H-F: Wire loop lesions (basement membrane thickening), Hematoxylin bodies (nuclear pathology), Fibrinoid necrosis.

Frequently asked questions

On which heart valves and leaflet surfaces do vegetations localize in Libman-Sacks endocarditis?: In atypical verrucous Libman-Sacks endocarditis, vegetations localize predominantly on left-sided valves: the mitral valve is most commonly affected, followed less frequently by the aortic or tricuspid valves. A characteristic feature is the bilateral location of deposits, meaning involvement of both sides of the valve leaflets. Verrucous deposits form directly within areas of endocardial ulceration.
How does joint involvement in SLE morphologically differ from rheumatoid arthritis?: Systemic lupus erythematosus features a non-erosive synovitis without joint deformation. Microscopy reveals shedding of lining synoviocytes, sclerosed villi, vasculitis with fibrinoid necrosis of vessel walls, and perivascular infiltration.
What specifically composes hematoxylin bodies in lupus nephritis?: Hematoxylin bodies represent free-lying degraded nuclei.
What type of necrosis is characteristic of vasculitis during an SLE flare?: Fibrinoid necrosis develops in the vessel walls of the skin, joints, and other organs during systemic lupus erythematosus exacerbations.
What is the "wire loop" lesion?: It is the pathological thickening of the glomerular capillary basement membranes resulting from massive subendothelial immune complex deposition.
Does joint involvement in SLE lead to joint deformities?: No, systemic lupus erythematosus is characterized by non-erosive synovitis that occurs without joint deformation.
What is the primary cause of death in patients with SLE?: The most frequent severe outcome of the disease is acute or chronic renal failure with uremia in the setting of progressive lupus nephritis.

Go deeper

WHO/ISN classification of lupus glomerulonephritis (focal and diffuse proliferative)
Morphological variants of glomerulonephritis (membranous, mesangioproliferative, fibroplastic)
Pathogenesis of CNS involvement: role of antiphospholipid and antineuronal antibodies
Tubulointerstitial renal changes and their link to immune complex deposits
Changes in the thymus and lymph nodes in SLE