Identify this histology picture
Reading File
Finding Sources
Finding Sources
Reading File
Finding Sources
Loading Image
Reading File
The textbook reference image confirms the diagnosis. Here is the complete analysis:
Diagnosis: Well-Differentiated Squamous Cell Carcinoma (SCC)
This H&E-stained section shows the classic histological hallmarks of well-differentiated squamous cell carcinoma. Here is what each zone represents:
Key Features Identified
| Feature | Location in Image | Significance |
|---|---|---|
| Keratin (epithelial) pearl | Central/lower portion - the large, concentrically layered whorled purple-pink structure | Pathognomonic for well-differentiated SCC |
| Malignant keratinocyte nests | Surrounding the pearl - irregular sheets of cells with glassy/eosinophilic cytoplasm | Invasive squamous component |
| Desmoplastic stromal reaction | Pink fibrous tissue interspersed between tumor nests | Host response to invasion |
| Glandular tissue (upper right) | Pink tubular/acinar structures | Likely residual normal tissue (e.g., esophageal mucosa or salivary gland) |
| Inflammatory infiltrate | Scattered dark cells throughout stroma | Stromal inflammatory response |
The Diagnostic Clue - Keratin Pearl
The large, concentrically laminated whorl at the center is a keratin pearl (also called an epithelial or squamous pearl). It forms when malignant squamous cells undergo aberrant terminal differentiation, producing keratin in concentric rings. This is:
- Seen only in squamous cell carcinoma (not adenocarcinoma or basal cell carcinoma)
- A marker of well-differentiated (grade 1) SCC - less-differentiated tumors lose this feature
As described in Goldman-Cecil Medicine: "Keratin pearls - abnormal squamous cells forming concentric layers - are associated with well-differentiated squamous cell carcinoma."
Likely Primary Site
Given the presence of glandular tissue in the upper right (possibly residual esophageal or salivary gland epithelium), this could represent SCC of the:
- Esophagus (proximal/middle third) - most common location for ESCC
- Head and neck (oral cavity, pharynx, larynx)
- Lung (centrally located SCCs with adjacent bronchial glands)
- Skin (with adnexal structures nearby)
Without clinical context (patient history, biopsy site), the exact primary cannot be determined from histology alone - but the diagnosis of well-differentiated SCC with keratin pearls is unambiguous.
Reference: Sleisenger & Fordtran's GI and Liver Disease (Fig. 48.4) - "Histopathology of squamous cell carcinoma showing nests of malignant keratinocytes with glassy cytoplasm, nucleoli, and keratin involving mucosa, with inflammatory stromal response. A keratin pearl is seen at center."
This is a shared conversation. Sign in to Orris to start your own chat.