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Fig. 1 | Journal of Medical Case Reports

Fig. 1

From: The undifferentiated carcinoma that became a melanoma: Re-biopsy of a cancer of an unknown primary site: a case report

Fig. 1

Tumor resected in 2012. The resection revealed malignant epithelioid cells with pale eosinophilic cytoplasm and pleomorphic nuclei with vesicular chromatin; hematoxylin, eosin and saffron staining (a). The resection revealed a positive reaction for cytokeratin AE1/AE3 (b). Scattered cells stained positive for S100 (c) and CD68 (d), representing tumor-associated macrophages, but tumor cells were S100 negative

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