Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report

Proliferating trichilemmal tumor (PTT) is a rare adnexal neoplasm of the hair follicle, which is usually detected on the scalp. We herein present a case of a PTT-like neoplasm arising in the external auditory canal (EAC). A man in his early sixties visited our hospital with a chief complaint of prol...

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Main Authors: Yoko Fukunaga, Masashi Kawamoto, Koji Nishimura, Nobuhiro Hakuba
Format: Article
Language:English
Published: Elsevier 2021-11-01
Series:Otolaryngology Case Reports
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2468548821000953
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spelling doaj-6784a096c2864a309ecf80bdc55a4b712021-09-11T04:30:28ZengElsevierOtolaryngology Case Reports2468-54882021-11-0121100354Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case reportYoko Fukunaga0Masashi Kawamoto1Koji Nishimura2Nobuhiro Hakuba3Department of Otolaryngology, Teikyo University Hospital, Mizonokuchi, Address: 5-1-1, Futago, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-8507, JapanDepartment of Pathology, Teikyo University Hospital, Mizonokuchi, Address: 5-1-1, Futago, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-8507, JapanDepartment of Otolaryngology, Teikyo University Hospital, Mizonokuchi, Address: 5-1-1, Futago, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-8507, JapanDepartment of Otolaryngology, Teikyo University Hospital, Mizonokuchi, Address: 5-1-1, Futago, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-8507, Japan; Corresponding author.Proliferating trichilemmal tumor (PTT) is a rare adnexal neoplasm of the hair follicle, which is usually detected on the scalp. We herein present a case of a PTT-like neoplasm arising in the external auditory canal (EAC). A man in his early sixties visited our hospital with a chief complaint of prolonged otorrhea. He underwent tympanoplasty on the basis of EAC cholesteatoma diagnosed at a local hospital, but otorrhea and debris recurred after the operation. Sixteen months after the first operation he was referred to our hospital. His EAC was filled with white debris, and computed tomography showed increased soft tissue density in the EAC and the middle ear. We performed a second operation, removing the entire circumference of EAC skin. Histopathological evaluation showed trichilemmal keratinization, which is characteristic of PTT. We concluded the patient had a PTT-like neoplasm. The tumor unfortunately became malignant fifteen months after the second operation. It is important to keep this clinical entity in mind when treating a patient with abnormal skin lesions in the EAC, as in this case presentation.http://www.sciencedirect.com/science/article/pii/S2468548821000953Proliferating trichilemmal tumorMalignant proliferating trichilemmal tumorExternal auditory canal
collection DOAJ
language English
format Article
sources DOAJ
author Yoko Fukunaga
Masashi Kawamoto
Koji Nishimura
Nobuhiro Hakuba
spellingShingle Yoko Fukunaga
Masashi Kawamoto
Koji Nishimura
Nobuhiro Hakuba
Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report
Otolaryngology Case Reports
Proliferating trichilemmal tumor
Malignant proliferating trichilemmal tumor
External auditory canal
author_facet Yoko Fukunaga
Masashi Kawamoto
Koji Nishimura
Nobuhiro Hakuba
author_sort Yoko Fukunaga
title Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report
title_short Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report
title_full Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report
title_fullStr Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report
title_full_unstemmed Proliferating trichilemmal tumor-like neoplasm in the external auditory canal: A case report
title_sort proliferating trichilemmal tumor-like neoplasm in the external auditory canal: a case report
publisher Elsevier
series Otolaryngology Case Reports
issn 2468-5488
publishDate 2021-11-01
description Proliferating trichilemmal tumor (PTT) is a rare adnexal neoplasm of the hair follicle, which is usually detected on the scalp. We herein present a case of a PTT-like neoplasm arising in the external auditory canal (EAC). A man in his early sixties visited our hospital with a chief complaint of prolonged otorrhea. He underwent tympanoplasty on the basis of EAC cholesteatoma diagnosed at a local hospital, but otorrhea and debris recurred after the operation. Sixteen months after the first operation he was referred to our hospital. His EAC was filled with white debris, and computed tomography showed increased soft tissue density in the EAC and the middle ear. We performed a second operation, removing the entire circumference of EAC skin. Histopathological evaluation showed trichilemmal keratinization, which is characteristic of PTT. We concluded the patient had a PTT-like neoplasm. The tumor unfortunately became malignant fifteen months after the second operation. It is important to keep this clinical entity in mind when treating a patient with abnormal skin lesions in the EAC, as in this case presentation.
topic Proliferating trichilemmal tumor
Malignant proliferating trichilemmal tumor
External auditory canal
url http://www.sciencedirect.com/science/article/pii/S2468548821000953
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