Trichilemmal cysts (TCs) are the most common cystic lesions arising on the scalp and up to 2% give rise to a proliferating trichilemmal tumor (PTT). A rare subset of PTTs are termed malignant due to their histologic characteristics, aggressive behavior and potential for metastasis. The histological hallmark of TCs and PTTs is the absence of a granular layer resulting in abrupt trichilemmal keritanization.
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Proliferating trichilemmal tumor (PTT) is a rare, benign adnexal tumor of hair follicles that commonly mimics malignancy. Excellent outcomes can be achieved with early surgical excision. Delayed presentations-as in this giant shoulder PTT-are made possible, in part, by patient education and healthcare accessibility in low-resource settings.
View Article and Find Full Text PDFUnlocking breast cancer in Brazilian public health system: Using tissue microarray for accurate immunohistochemical evaluation with limitations in subtyping.
Womens Health (Lond)
January 2025
Department of Pathology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Background: Breast cancer (BC) is a significant burden on healthcare systems, especially in low- and middle-income countries where access to diagnosis and treatment is challenging.
Objectives: The purpose of this study was to assess the diagnostic accuracy and cost using tissue microarray (TMA) instead of traditional immunohistochemical (IHC) evaluation for estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor 2 (HER2), and the proliferation marker Ki-67 and BC subtyping within the Brazilian public health system.
Design: This is a retrospective cohort study comparing TMA slides with traditional whole-slide evaluation for IHC markers in 242 BC cases.
A Unique Role of the Oncoplastic Breast Surgeon's Approach to an Inframammary Proliferating Trichilemmal Cyst: A Case Report.
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Department of Surgery, Ng Teng Fong General Hospital, Singapore, SGP.
Trichilemmal cysts, also known as pilar cysts, are commonly found on hair-bearing surfaces, such as the scalp or hairline. These are cysts that form from hair follicles and are benign. We describe an unusual case of a middle-aged lady presenting with a longstanding left-sided inframammary mass that had started growing more in the last year prior to the presentation.
View Article and Find Full Text PDFHistologic distinction and potential misidentification of proliferating pilar tumors versus squamous cell carcinoma.
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Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, Texas. Electronic address:
Clinical Characteristics and Genomic Profile of Malignant Proliferating Trichilemmal Tumor: A Systematic Review of the Literature.
J Surg Oncol
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Department of Surgery, MercyOne Medical Center, Des Moines, Iowa, USA.
Malignant proliferating trichilemmal tumors (MPTT) are rare skin lesions arising from the outer sheath of the hair follicle root. Because of their rarity and difficulty in pathologic identification, these skin lesions are often initially misdiagnosed. After a literature review, we found initial clinical or histopathological misdiagnosis has an associated 10.
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