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Merkel Cell Carcinoma on the Face: Case Report

Merkel Cell Carcinoma on the Face: Case Report

Additional immunohistochemistry markers were as follows: TTF-1 (thyroid transcription factor-1) was negative and CK20 (cytokeratin 20) was positive in the tumor cells. Ki67 (Kiel 67) showed a high proliferative index. A summary of the immunohistochemistry results is provided in Table 2. Immunohistochemistry markers confirmed the diagnosis of MCC and ruled out a metastatic deposit of small cell carcinoma of the lung. Histopathological features were also in favor of MCC. They are represented in Figure 2.

Shaikha Salah Alhaj, Fatma Abdulghaffar Qaderi, Tarek Ibrahim, Maha Almohammad

JMIR Dermatol 2024;7:e56658