Morphological structure of a gumma
Histologically, a syphilitic granuloma consists of three clearly distinguishable zones:
- Center of the granuloma. This contains a focus of coagulative necrosis with a characteristic sticky consistency. Complete destruction of elastic fibers occurs in this area.
- Cellular infiltrate. Inflammatory cells accumulate around the necrotic masses. The infiltrate includes neutrophil leukocytes, lymphocytes, plasma cells, macrophages, and fibroblasts. There is also a moderate number of epithelioid cells and multinucleated Pirogov-Langhans giant cells.
- Peripheral zone. The outer layer is represented by intensely 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 lesions and syphilitic mesaortitis
The pathogenesis of vascular disorders is related to the fact that Treponema pallidum organisms incubate directly within the vessels, causing primary damage to their inner lining (intima).
In addition to classic isolated gummas, diffuse gummatous infiltration is typical for tertiary syphilis. It is most frequently localized in the middle layer (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 vessels nourishing the aortic wall (vasa vasorum). Shueninov's fuchselin special stain is used to identify destroyed elastic fibers in the lesion area.
Macroscopic picture, outcomes, and complications
The development of mesaortitis goes through several stages: necrosis destroys the elastic framework of the aorta, and granulation tissue proliferates in its place, which then matures into coarse connective tissue. This leads to uneven sclerosis. Macroscopically, the inner lining of the aorta becomes wrinkled, uneven, and nodular due to scarred retractions — forming the so-called "shagreen skin".
Complications and outcomes:
- Healing. Characteristic coarse star-shaped scars form at the site of the gumma.
- Destruction. When localized in the oropharynx and nasopharynx, gummas destroy the bones of the nose and the 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. Its rupture results in sudden death of the patient. The clinical significance of other gummas largely depends on their localization (brain, spinal cord, or liver).
- Loss of immunity. As gummatous lesions progress, immunity practically disappears, making reinfection with syphilis possible.
Briefly: answers to topical questions
Which other specific granulomas must a syphilitic gumma be differentiated from?
- Tuberculous granuloma (tubercles) — a specific proliferative inflammation containing epithelioid cells, lymphocytes, macrophages, and multinucleated Pirogov-Langhans giant cells with central caseous necrosis.
- Leproma — a specific lesion in leprosy consisting of Virchow cells, lymphocytes, plasmacytes, fibroblasts, and macrophages, usually without prominent necrosis.
What does the liver look like macroscopically during the 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 vessel walls (vasa vasorum) in syphilitic mesaortitis. The affected area exhibits lympholeukocytic or lymphoplasmacytic infiltration; the inflammation is associated with involvement of the aortic tunica media and subsequent destruction of its elastic framework.
A gumma leaves STARS in memory, and SHAGREEN SKIN on the aorta. Remember two main macroscopic features: star-shaped scars upon healing and a wrinkled aortic intima due to destruction of the elastic framework.
Class and exam questions
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 organisms incubate directly within blood vessels. This causes primary damage to the inner lining (intima) and productive inflammation.
How does the macroscopic symptom of "shagreen skin" form?
Necrosis destroys the elastic framework of the aorta. Coarse connective tissue proliferates in its place, forming scarred retractions that render the intima nodular and wrinkled.
What else to study on this topic
- Cellular composition of the gummatous infiltrate and the role of Pirogov-Langhans cells
- Pathogenesis of productive endovasculitis and vasa vasorum involvement
- Mechanism of aortic aneurysm formation in syphilitic mesaortitis
- Specific histological stains (Shueninov's fuchselin)
- Clinical significance of gumma localization in the brain and liver
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