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The aim of the study was to assess the value of scalp dermoscopy in differentiation between erythrodermic CTCL, psoriasis, and atopic dermatitis. A total of 76 patients were included into the study <jats:bold>(<\/jats:bold>16 patients with erythrodermic CTCL, 20 patients with psoriatic erythroderma, 20 with erythrodermic atopic dermatitis, and 20 healthy volunteers). The most common trichoscopic features of erythrodermic CTCL were: numerous <jats:italic>pili torti<\/jats:italic>, numerous broken hairs, white thick interfollicular bands, and patchy hyperpigmentation of the background. They were observed in 81% (13\/16), 75% (12\/16), 56% (9\/16), and 37.5% (6\/16) of patients with CTCL, respectively (p\u2009&lt;\u20090.001). Other specific features of erythrodermic CTCL were 8-shaped hairs (19%; 3\/16) and visible anagen bulbs (12.5%; 2\/16) (p\u2009&lt;\u20090.05 and p\u2009=\u20090.052, respectively). The most common vascular pattern of erythrodermic CTCL was perifollicular arrangement of glomerular (50%; 8\/16; p\u2009&lt;\u20090.001) or linear vessels (31%; 5\/16; p\u2009&lt;\u20090.05). Follicular spicules-like scaling was pathognomonic for erythrodermic CTCL (12%, 2\/16) although its presence did not reach statistical significance (p\u2009=\u20090.052). In conclusion,\u00a0the characteristic trichoscopic findings of erythrodermic CTCL are numerous <jats:italic>pili torti<\/jats:italic>, eight-shaped hairs, thick white interfollicular bands, color heterogeneity of the background and perifollicular arrangement of vessels.<\/jats:p>","DOI":"10.1038\/s41598-020-78233-1","type":"journal-article","created":{"date-parts":[[2021,1,11]],"date-time":"2021-01-11T11:25:44Z","timestamp":1610364344000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Cutaneous T-cell lymphoma in erythrodermic cases may be suspected on the basis of scalp examination with dermoscopy"],"prefix":"10.1038","volume":"11","author":[{"given":"Adriana","family":"Rakowska","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magdalena","family":"Jasi\u0144ska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariusz","family":"Sikora","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanna","family":"Czuwara","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrycja","family":"Gajda-Mr\u00f3z","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olga","family":"Warszawik-Hendzel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ma\u0142gorzata","family":"Kwiatkowska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Wa\u015bkiel-Burnat","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ma\u0142gorzata","family":"Olszewska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lidia","family":"Rudnicka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,1,11]]},"reference":[{"key":"78233_CR1","doi-asserted-by":"publisher","first-page":"519","DOI":"10.1111\/j.1600-0560.2006.00662.x","volume":"34","author":"K Reddy","year":"2007","unstructured":"Reddy, K. & Bhawan, J. 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