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. 2021 Mar 16:1–11. doi: 10.1159/000514822

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Copyright © 2021 by S. Karger AG, Basel

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 2 — Abnormal morphology and phenotype in enlarged vascular endothelial cells: H&E (a); CK7 (b, c). Lymphocyte infiltration of vascular walls: CD3 (d), CD4 (e), and CD8 (f): perivascular lymphocytes mostly exhibit a CD3+, CD4+, CD8-negative immunophenotype. Ph-STAT3 (g): strong nuclear expression in endothelial cells. PD-L1 (h, i), and IDO (j): strong expression in capillaries and venules. CD61 (k): occasional positive megakaryocytes within interstitial capillaries. Immunohistochemical profile of aggregates of alveolar mononuclear cells: CK7 negative (l), CD11c+ (m), CD4+ (n), CD14+ (o), CD123+ (p), CD206+ (q), CD303-negative (r), and PD-L1+ (s). CK7, cytokeratin 7.