Primary Pulmonary Malignant Melanoma Found While Evaluating New Onset Cough: A Case Presentation and Literature Review

Figure 4

H&E stain ((a) 200x; (b) 400x) with tumor cells located under bronchial mucosa composed of epithelioid tumor cells with large amounts of acid cytoplasm and prominent nuclei. Mitotic figures are easily found. Note dark brown pigment in tumor cells (Arrows). Immunohistochemically, tumor cells were positive for S-100 and HBM 45 ((c) and (d)), amongst others.

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(b)

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(d)