{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T14:34:20Z","timestamp":1787841260558,"version":"build-2784847793"},"reference-count":8,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","license":[{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0"}],"content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Trichilemmal tumors are rare dermal neoplasms derived from the outer root sheath of hair follicles, showing a follicular differentiation on histology and are categorized into benign and malignant entities. Usually presenting as solitary lesions, they have a predilection for women in the fourth to eighth decades of life, with the scalp being the most common site of occurrence. In this article, we report two extremely rare cases, one diagnosed as malignant proliferating trichilemmal tumor with sarcomatous differentiation (MPTT-S) and the other as proliferating trichilemmal cyst with foci of carcinoma\n                    <jats:italic toggle=\"yes\">in situ<\/jats:italic>\n                    (PTC-CIS). These tumors, thus, reveal a spectrum of unusual trichilemmal tumors with similar clinical presentations but contrasting histopathological characteristics. Squamous cell carcinoma is a close differential diagnosis of these lesions; hence, a higher degree of awareness is a requisite for an accurate understanding and diagnosis, as both of them have distinct prognoses and treatment options.\n                  <\/jats:p>","DOI":"10.4103\/ijpm.ijpm_333_24","type":"journal-article","created":{"date-parts":[[2026,1,19]],"date-time":"2026-01-19T14:00:14Z","timestamp":1768831214000},"page":"118-121","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":0,"title":["Unusual variants of trichilemmal tumors \u2013 Report of two cases with review of literature"],"prefix":"10.4103","volume":"69","author":[{"given":"Abhiruchi","family":"Sharma","sequence":"first","affiliation":[{"name":"Department of Pathology, Maulana Azad Medical College, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deepika","family":"Rana","sequence":"additional","affiliation":[{"name":"Department of Pathology, Maulana Azad Medical College, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nita","family":"Khurana","sequence":"additional","affiliation":[{"name":"Department of Pathology, Maulana Azad Medical College, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sushanto","family":"Neogi","sequence":"additional","affiliation":[{"name":"Department of Surgery, Maulana Azad Medical College, New Delhi, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","published-online":{"date-parts":[[2026,1,19]]},"reference":[{"key":"R1-20260403","doi-asserted-by":"crossref","first-page":"240","DOI":"10.4103\/0973-1482.39001","article-title":"Malignant pilar tumor of the scalp: A case report and review of literature","volume":"3","author":"Siddha","year":"2007","journal-title":"J Cancer Res Ther"},{"key":"R2-20260403","doi-asserted-by":"crossref","first-page":"178","DOI":"10.1111\/j.1600-0560.1983.tb00324.x","article-title":"Proliferating trichilemmal cyst","volume":"10","author":"Poiares","year":"1983","journal-title":"J Cutan Pathol"},{"key":"R3-20260403","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1016\/j.jdcr.2022.01.033","article-title":"Malignant proliferating trichilemmal tumors arising in patients with multiple trichilemmal cysts: A case series","volume":"22","author":"Kearns-Turcotte","year":"2022","journal-title":"JAAD Case Rep"},{"key":"R4-20260403","doi-asserted-by":"crossref","first-page":"506","DOI":"10.1034\/j.1600-0560.2002.290810.x","article-title":"Proliferating trichilemmal tumor with a malignant spindle cell component","volume":"29","author":"Plumb","year":"2002","journal-title":"J Cutan Pathol"},{"key":"R5-20260403","doi-asserted-by":"crossref","first-page":"310","DOI":"10.1111\/j.1600-0560.1979.tb01139.x","article-title":"Proliferating pilar cyst with spindle cell component","volume":"6","author":"Warner","year":"1979","journal-title":"J Cutan Pathol"},{"key":"R6-20260403","doi-asserted-by":"crossref","first-page":"479","DOI":"10.1097\/00000372-199010000-00008","article-title":"Proliferating trichilemmal cyst with spindle cell carcinoma","volume":"12","author":"Mori","year":"1990","journal-title":"Am J Dermatopathol"},{"key":"R7-20260403","doi-asserted-by":"crossref","first-page":"444","DOI":"10.2340\/0001555573444446","article-title":"Malignant aneuploid spindle-cell transformation in a proliferating trichilemmal tumour","volume":"73","author":"Alvarez-Qui\u00f1ones","year":"1993","journal-title":"Acta Derm Venereol"},{"key":"R8-20260403","doi-asserted-by":"crossref","first-page":"e99","DOI":"10.1097\/DAD.0b013e31827401b5","article-title":"Cystic tricholemmal carcinoma in situ","volume":"35","author":"Lin","year":"2013","journal-title":"Am J Dermatopathol"}],"container-title":["Indian Journal of Pathology and Microbiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ovid.com\/10.4103\/ijpm.ijpm_333_24","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T13:47:25Z","timestamp":1787838445000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ovid.com\/10.4103\/ijpm.ijpm_333_24"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,1]]},"references-count":8,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2026]]}},"URL":"https:\/\/doi.org\/10.4103\/ijpm.ijpm_333_24","relation":{},"ISSN":["0377-4929","0974-5130"],"issn-type":[{"value":"0377-4929","type":"print"},{"value":"0974-5130","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,1]]},"assertion":[{"value":"2024-04-28","name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-07-15","name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}}]}}