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What histopathology slide is this
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Reading File
This is a low-power H&E-stained histopathology slide showing features most consistent with a chronic granulomatous/suppurative lesion, with the top differential being Actinomycosis.
Key Findings on the Slide
| Feature | What You See |
|---|---|
| Stain | Hematoxylin & Eosin (H&E) |
| Magnification | Low power (scanning view) |
| Central material | Amorphous, deeply basophilic (purple) lobulated masses - these resemble sulfur granules (dense colonies of filamentous bacteria) |
| Surrounding zone | Thick band of dense chronic inflammatory cells (lymphocytes, plasma cells, histiocytes) |
| Outer wall | Fibrotic collagenous capsule with fibroblasts and small vessels (granulation tissue) |
| Periphery | Adipose tissue visible, indicating the lesion is expanding into surrounding soft tissue |
Top Differential Diagnoses
1. Actinomycosis (Most Likely)
The classic "sulfur granules" - basophilic, lobulated bacterial colonies (Actinomyces israelii, a filamentous gram-positive anaerobe) - surrounded by suppuration and an outer fibrous wall is the hallmark. The layered architecture here fits perfectly.
2. Chronic Abscess with Dystrophic Calcification
A long-standing pyogenic abscess where the necrotic core has calcified (basophilic), walled off by granulation and fibrous tissue.
3. Mycetoma (Eumycetoma/Actinomycetoma)
Another granulomatous infection with grains/granules, sinus tracts, and fibrosis - especially in the lower limbs.
Confirmatory Steps Needed
To pin down the exact diagnosis, the following would be needed:
- Higher power magnification to visualize individual filamentous bacterial structures within the granules
- Gram stain - Actinomyces stains gram-positive with filaments
- GMS (Grocott's Methenamine Silver) - to rule out fungal etiology
- AFB/Fite stain - to exclude Nocardia or mycobacteria
- Clinical correlation - site of lesion (jaw/cervicofacial = classic actinomycosis), patient history of poor dentition or trauma
Bottom line: The combination of basophilic central granules/masses + surrounding chronic inflammation + fibrous capsule on this H&E slide is the classic "wooden flask" appearance of actinomycosis until proven otherwise.
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