Figure 4.

The melanin pigment is positive for Masson-Fontana. (A) and is bleached upon treatment with potassium permanganate (B). The tumor cells are strong staining for CD56 (C) and weak staining for chromogranin A (D).

Zhao et al. Diagnostic Pathology 2012 7:77   doi:10.1186/1746-1596-7-77
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