Fig. 2From: Pigmented spindle cell variant of a thymic atypical carcinoid in an octogenarianGross appearance and histologic findings of the resected tumor. a Dark-brownish cut surface. b Hematoxylin–eosin staining revealing nesting proliferation of the spindle-shaped tumor cells and marked dark-brownish pigmentation in the macrophages. c Fontana–Masson staining confirming melanin in the pigmented cellsBack to article page