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. Author manuscript; available in PMC: 2014 Mar 30.
Published in final edited form as: Ear Nose Throat J. 2013 Jan;92(1):36–40. doi: 10.1177/014556131309200112

Figure 2.

Figure 2

A: Cross-section examination of the tumor reveals dark-brown pigmentation in the mucosa and tumor parenchyma with areas of hemorrhage and necrosis. B: Microscopic section shows the hypercellular tumor partially covered by squamous mucosa, along with areas of pigmentation (H&E, original magnification ×50). C: The tumor is composed of heavily pigmented pleomorphic spindle cells with mitotic figures (H&E, original magnification ×100). D: Immunohistochemistry shows diffuse positivity for HMB-45 (original magnification ×100)