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. 2021 Sep 3;160(3):e289–e293. doi: 10.1016/j.chest.2021.04.055

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Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Pathologic analysis of the patient’s endobronchial mass. Hematoxylin and eosin stain (original magnification 400×) showing nests of tumor cells separated by delicate fibrovascular septae. The cells have granular, eosinophilic cytoplasm and round, monotonous nuclei with inconspicuous nucleoli, and coarse “salt and pepper” chromatin (A), Chromogranin immunohistochemical stain showing diffuse, strong cytoplasmic staining (B), synaptophysin immunohistochemical stain showing diffuse, strong cytoplasmic staining (C), and Ki-67 immunohistochemical stain demonstration of low proliferative index.