https://www.selleckchem.com/products/indisulam.html Immunohistochemically, the estrogen-negative, CK7-positive, C-erb B2-positive intralymphatic metastases were associated with extensive infiltration of CD8-positive cytototoxic T lymphocytes. Factors that may have precluded the implantation of intralymphatic metastases leading to SR are discussed, with local immune surveillance being one major hypothesis. © 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.BACKGROUND Eccrine duct dilatation (EDD) has been noted to occur significantly more often in primary lymphocytic scarring alopecias compared with non-scarring alopecias, thus serving as a possible histopathologic marker for primary scarring alopecias with a lymphocytic infiltrate. This study aims to determine the presence and role of EDD in primary neutrophilic scarring alopecias. METHODS We performed a retrospective review comparing primary scarring alopecia (neutrophilic, n = 90; lymphocytic, n = 100) and non-scarring alopecia (n = 123) for presence of EDD, seen in Boston University School of Medicine between 2013 and 2017. RESULTS EDD was more commonly seen in primary neutrophilic scarring (62.2%, 56/90) and primary lymphocytic scarring alopecias (54.0%, 54/100) than in non-scarring alopecias (25.2%, 31/123) (P  less then  0.001). Albeit uncommon, non-scarring alopecias exhibited the biggest ratio of dilated eccrine duct lumen to background duct lumen (14.33), followed by lymphocytic (10.99) and neutrophilic scarring alopecias (6.66). CONCLUSION EDD is seen more frequently in primary scarring alopecias compared with non-scarring alopecias and usually found in sections containing inflammation and dermal fibrosis, serving as a possible histopathologic clue for a scarring process. Non-scarring alopecias have significantly fewer but considerably larger EDD which may imply a different pathologic cause. This article is protected by copyright. All rights reserved. This article is protected by copyright. A