Recurrent Adenomatous Neuroendocrine Tumor of the Middle Ear: A Diagnostic Challenge

Figure 2

(a) Hematoxylin-eosin (HE) stain: the pattern of growth is trabecular or glandular. The tumor cells are uniform and cuboidal with a moderately abundant acidophilic cytoplasm. Mitoses are rare and necrosis absent. (b) Immunostaining for synaptophysin. (c) Immunoreactivity: typical immunostaining for chromogranin.

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(b)

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