Proliferating Pilar Tumor: Two Cases and a Review of the Literature

Ziad Alshaalan, Parth Patel, Ethan Routt, David Ciocon

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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.

Original languageEnglish
Pages (from-to)1346-1348
Number of pages3
JournalJournal of Drugs in Dermatology
Issue number12
StatePublished - Dec 2021
Externally publishedYes


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