Fig. 3From: Primary urethral small cell melanoma with neuroendocrine differentiation: a case reportHistochemical and immunohistochemical findings: Fontana-Masson stain highlighted the black stained melanin granules (a, FM, ×200). The tumor cells were immunopositive for HMB-45 (b), Melan-A (c), CD56 (d), chromogranin (e), and synaptophysin (f); ×200Back to article page