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Syphilitic Granuloma

Q: Which other specific granulomas must be differentiated from a syphilitic gumma?

Tuberculous granuloma (tubercle) — specific proliferative inflammation containing epithelioid cells, lymphocytes, macrophages, and Langhans multinucleated giant cells with central caseous necrosis.Leproma — a specific lesion in leprosy consisting of Virchow cells, lymphocytes, plasma cells, fibroblasts, and macrophages, typically lacking prominent necrosis.

Q: What specific changes occur in the *vasa vasorum* in syphilitic mesaortitis?

Vasculitis develops in the vasa vasorum during syphilitic mesaortitis. The affected area shows lympholeukocytic or lymphoplasmacytic infiltration; the inflammation is linked to involvement of the aortic media and subsequent destruction of its elastic framework.

Q: Why does productive endovasculitis occur in syphilis?

Treponema pallidum incubates directly inside blood vessels. This causes primary damage to the inner lining (intima) and productive inflammation.

Gumma syphilitica

For medical students2 min readUpdated 2026-10-10

A syphilitic granuloma (gumma) is a specific focus of productive inflammation that develops in tissues during the tertiary stage of syphilis. The appearance of such granulomas serves as the morphological expression of non-sterile immunity. A gumma has a characteristic layered structure with a necrotic zone in the center and a dense cellular wall at the periphery.

Pathogen*Treponema pallidum* (spirochete), which incubates within blood vessels

StageTertiary syphilis, reflecting a state of non-sterile immunity

Gumma CenterCoagulative necrosis of a gummy consistency with destruction of elastic fibers

Common TargetAscending aorta and aortic arch, leading to syphilitic mesaortitis

Morphological Structure of a Gumma

Histologically, a syphilitic granuloma consists of three clearly demarcated zones:

Granuloma Center. This contains a focus of coagulative necrosis with a characteristic gummy consistency. Complete destruction of elastic fibers occurs in this area.
Cellular Infiltrate. Inflammatory cells accumulate around the necrotic masses. The infiltrate includes neutrophils, lymphocytes, plasma cells, macrophages, and fibroblasts. A moderate number of epithelioid cells and multinucleated Langhans giant cells are also present.
Peripheral Zone. The outer layer is represented by actively proliferating connective tissue that forms a dense capsule. Numerous small blood vessels showing signs of productive endovasculitis are found in the tissues adjacent to the capsule.

Vascular Involvement and Syphilitic Mesaortitis

The pathogenesis of vascular lesions is related to the fact that Treponema pallidum incubates directly within blood vessels, primarily damaging their inner lining (the intima).

In addition to classic isolated gummas, tertiary syphilis is characterized by diffuse gummatous infiltration. Most frequently, this localizes in the tunica media of the ascending aorta and aortic arch, causing syphilitic mesaortitis.

Microscopically, the composition of such an infiltrate is completely identical to a gumma (including caseous necrosis and lympholeukocytic infiltration), but there is a key difference: no capsule forms around the diffuse infiltrate. The inflammation involves the small nutritional vessels of the aortic wall (vasa vasorum). Special staining (such as Shueninov's fuchsin stain) is used to visualize destroyed elastic fibers within the lesion.

Macroscopic Appearance, Outcomes, and Complications

The development of mesaortitis occurs in several stages: necrosis destroys the elastic framework of the aorta, granulation tissue proliferates in its place, which then matures into coarse connective tissue. This leads to uneven sclerosis. Macroscopically, the internal lining of the aorta becomes wrinkled, uneven, and nodular due to scarred retractions—forming the so-called "shagreen skin" appearance.

Complications and Outcomes:

Healing. Coarse star-shaped (stellate) scars form at the site of the gumma.
Destruction. When localized in the oropharynx and nasopharynx, gummas destroy the nasal bones and hard palate. This leads to severe facial deformity and impairment of vital functions: breathing, swallowing, and speech.
Fatal Complications. Involvement of the aorta frequently leads to aneurysm formation. Rupture of the aneurysm results in sudden death. The clinical significance of other gummas depends heavily on their localization (brain, spinal cord, liver).
Loss of Immunity. As gummatous lesions progress, immunity practically disappears, making reinfection with syphilis possible.

Mnemonic

A gumma leaves STARS in its wake, and SHAGREEN SKIN on the aorta. Remember the two main macroscopic features: stellate scars upon healing and a wrinkled aortic intima due to destruction of the elastic framework.

Frequently asked questions

Which other specific granulomas must be differentiated from a syphilitic gumma?

Tuberculous granuloma (tubercle) — specific proliferative inflammation containing epithelioid cells, lymphocytes, macrophages, and Langhans multinucleated giant cells with central caseous necrosis.
Leproma — a specific lesion in leprosy consisting of Virchow cells, lymphocytes, plasma cells, fibroblasts, and macrophages, typically lacking prominent necrosis.

What does the liver look macroscopically upon healing of multiple syphilitic gummas?

Following the healing of multiple syphilitic gummas, extensive scarring with organ deformation develops in the liver, causing it to become lobulated and nodular, forming a characteristic lobulated liver (hepar lobatum).

What specific changes occur in the *vasa vasorum* in syphilitic mesaortitis?

Vasculitis develops in the vasa vasorum during syphilitic mesaortitis. The affected area shows lympholeukocytic or lymphoplasmacytic infiltration; the inflammation is linked to involvement of the aortic media and subsequent destruction of its elastic framework.

How does the diffuse infiltrate in the aorta differ from a classic gumma?

The main microscopic difference is that no connective tissue capsule forms around the diffuse gummatous infiltrate in the aortic wall.

Why does productive endovasculitis occur in syphilis?

Treponema pallidum incubates directly inside blood vessels. This causes primary damage to the inner lining (intima) and productive inflammation.

How does the macroscopic "shagreen skin" sign form?

Necrosis destroys the elastic framework of the aorta. Coarse connective tissue proliferates in its place, forming scarred retractions that make the intima nodular and wrinkled.

Go deeper

Cellular composition of the gummatous infiltrate and the role of Langhans giant cells
Pathogenesis of productive endovasculitis and vasa vasorum involvement
Mechanism of aortic aneurysm formation in syphilitic mesaortitis
Specific histological stains (Shueninov's fuchsin)
Clinical significance of gumma localization in the brain and liver