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Epidermal basaloid cell hyperplasia overlying dermatofibromas
Christian Fredrik Lindboe1, Leif Løvdal
1Department of Pathology, Sørlandet Sykehus HF, Kristiansand, Norway. christian.fredrik.lindboe@sshf.no
The American Journal of Dermatopathology
|December 24, 2010
Summary
Basaloid cell hyperplasia (BCH) in dermatofibromas can mimic basal cell carcinoma (BCC). Increased CK20-positive Merkel cells in BCH may help differentiate it from BCC.
Area of Science:
- Dermatopathology
- Surgical Pathology
- Oncology
Background:
- Dermatofibromas can exhibit basaloid cell hyperplasia (BCH), mimicking basal cell carcinoma (BCC).
- Distinguishing between reactive BCH and neoplastic BCC is crucial for accurate diagnosis and patient management.
Purpose of the Study:
- To investigate the immunohistochemical profile of basaloid cell hyperplasia (BCH) in dermatofibromas.
- To determine if specific markers can differentiate BCH from basal cell carcinoma (BCC).
Main Methods:
- Analysis of 1117 dermatofibromas, identifying 25 cases with basaloid cell hyperplasia (BCH).
- Application of an 18-antibody panel to 6 BCH cases and 20 basal cell carcinoma (BCC) samples.
- Immunohistochemical staining for CK20-positive Merkel cells.
Main Results:
- Basaloid cell hyperplasia (BCH) was observed in 2.2% of dermatofibromas, predominantly in men.
- Increased CK20-positive Merkel cells were found in 4 out of 6 BCH cases.
- CK20-positive Merkel cells were absent or reduced in all 20 basal cell carcinoma (BCC) cases.
- No other antibodies could differentiate between BCH and BCC.
Conclusions:
- Increased CK20-positive Merkel cells may serve as a potential marker to distinguish reactive basaloid cell hyperplasia (BCH) from neoplastic basal cell carcinoma (BCC).
- Further research is needed to confirm the diagnostic utility of this finding.
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