{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,27]],"date-time":"2026-06-27T06:02:56Z","timestamp":1782540176946,"version":"3.54.5"},"reference-count":13,"publisher":"BMJ","issue":"5","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2019,5,8]]},"published-print":{"date-parts":[[2019,5]]},"abstract":"<jats:p>Triangular alopecia presents as a unilateral triangular-shaped non-scarring alopecia usually involving the temporal scalp. There are few reports of occipital scalp involvement and bilateral disease. Usually it is seen at 2\u20133 years of age but occasionally can be present at birth. Here we present a unique case of triangular alopecia involving the eyebrows in a 23-year-old man. He had bilateral symmetrical involvement since birth. Points in favour of triangular alopecia in our case were non-scarring alopecia, oval-to-triangular shape, fringe of terminal hair at superior margin; trichoscopy showing significant decrease in hair diameter diversity with increased number of vellus and intermediate hair and histopathology showing normal hair follicle density and increased vellus and intermediate hair (miniaturisation) with absence of inflammation on histopathology. Other differential diagnoses kept were partial duplication of eyebrows, congenital alopecia areata and mild form of ectodermal dysplasia.<\/jats:p>","DOI":"10.1136\/bcr-2018-227472","type":"journal-article","created":{"date-parts":[[2019,5,25]],"date-time":"2019-05-25T06:09:23Z","timestamp":1558764563000},"page":"e227472","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Congenital symmetrical circumscribed patterned non-scarring alopecia of eyebrows: a variant of congenital triangular alopecia or an anatomical variation?"],"prefix":"10.1136","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3962-0808","authenticated-orcid":false,"given":"Deepika","family":"Yadav","sequence":"first","affiliation":[{"name":"Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sujay","family":"Khandpur","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1199-8075","authenticated-orcid":false,"given":"Sweta","family":"Subhadarshani","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kanika","family":"Sahni","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Venereology, All India Institute of Medical Sciences, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2019,5,24]]},"reference":[{"key":"2025082711385939000_12.5.e227472.1","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1111\/j.1399-0004.1988.tb03438.x","article-title":"Partial duplication of the eyebrows with other congenital malformations: a new syndrome","volume":"33","author":"Berkenstadt","year":"1988","journal-title":"Clin Genet"},{"key":"2025082711385939000_12.5.e227472.2","doi-asserted-by":"crossref","first-page":"467","DOI":"10.1111\/j.1399-0004.1989.tb02974.x","article-title":"Partial duplication of the eyebrows with other congenital malformations: a new syndrome","volume":"35","author":"Gross-Kieselstein","year":"1989","journal-title":"Clin Genet"},{"key":"2025082711385939000_12.5.e227472.3","unstructured":"Doxanas MT , Eyebrows ARL . Eyebrows, eyelids and anterior orbit. In: Doxanas MT , Anderson RL , eds. Clinical Orbital Anatomy. Ch. 4. \u00a0Baltimore: Williams and Wilkins, 1984:57\u201388."},{"key":"2025082711385939000_12.5.e227472.4","doi-asserted-by":"crossref","first-page":"154","DOI":"10.4103\/0974-7753.125617","article-title":"Double eye brow: a rare case report","volume":"5","author":"Kar","year":"2013","journal-title":"Int J Trichol"},{"key":"2025082711385939000_12.5.e227472.5","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1111\/j.1346-8138.2010.00817.x","article-title":"Temporal triangular alopecia and a review of 52 past cases","volume":"37","author":"Yamazaki","year":"2010","journal-title":"J Dermatol"},{"key":"2025082711385939000_12.5.e227472.6","doi-asserted-by":"crossref","first-page":"48","DOI":"10.4103\/0974-7753.160089","article-title":"Congenital Triangular Alopecia","volume":"7","author":"Yin Li","year":"2015","journal-title":"Int J Trichol"},{"key":"2025082711385939000_12.5.e227472.7","doi-asserted-by":"crossref","first-page":"1621","DOI":"10.1111\/jdv.12656","article-title":"Temporal triangular alopecia: significance of trichoscopy in differential diagnosis","volume":"29","author":"Karada\u011f K\u00f6se","year":"2015","journal-title":"J Eur Acad Dermatol Venereol"},{"key":"2025082711385939000_12.5.e227472.8","doi-asserted-by":"crossref","first-page":"634","DOI":"10.1016\/j.jaad.2016.04.053","article-title":"Clinical and trichoscopic characteristics of temporal triangular alopecia: A multicenter study","volume":"75","author":"Fern\u00e1ndez-Crehuet","year":"2016","journal-title":"J Am Acad Dermatol"},{"key":"2025082711385939000_12.5.e227472.9","first-page":"2014","article-title":"Congenital triangular alopecia","volume":"1","author":"Lacarrubba","year":"2014","journal-title":"BMJ Case Rep"},{"key":"2025082711385939000_12.5.e227472.10","doi-asserted-by":"crossref","first-page":"991","DOI":"10.1016\/S0190-9622(87)70127-3","article-title":"Congenital triangular alopecia. Report of fourteen cases","volume":"16","author":"Tosti","year":"1987","journal-title":"J Am Acad Dermatol"},{"key":"2025082711385939000_12.5.e227472.11","doi-asserted-by":"crossref","first-page":"205","DOI":"10.1016\/S0190-9622(94)70147-4","article-title":"Clinical and histologic findings in temporal triangular alopecia","volume":"31","author":"Trakimas","year":"1994","journal-title":"J Am Acad Dermatol"},{"key":"2025082711385939000_12.5.e227472.12","doi-asserted-by":"crossref","first-page":"597","DOI":"10.1111\/j.1600-0560.2009.01388.x","article-title":"Temporal triangular alopecia with decreased follicular density","volume":"37","author":"Silva","year":"2010","journal-title":"J Cutan Pathol"},{"key":"2025082711385939000_12.5.e227472.13","doi-asserted-by":"crossref","first-page":"572","DOI":"10.1111\/j.1346-8138.2011.01348.x","article-title":"Temporal triangular alopecia: trichoscopic diagnosis","volume":"39","author":"Inui","year":"2012","journal-title":"J Dermatol"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2018-227472","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T18:39:08Z","timestamp":1756319948000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2018-227472"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,5]]},"references-count":13,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2019,5,24]]},"published-print":{"date-parts":[[2019,5]]}},"alternative-id":["10.1136\/bcr-2018-227472"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2018-227472","relation":{},"ISSN":["1757-790X"],"issn-type":[{"value":"1757-790X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,5]]}}}