AUTHOR=Wang Guojie , Zhou Xuan , Luo Junqi , Hu Qiyi , Zhang Jie 

TITLE=Case report: Malignant proliferating trichilemmal tumor of the thumb

JOURNAL=Frontiers in Oncology

VOLUME=12

YEAR=2022

URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2022.1005206

DOI=10.3389/fonc.2022.1005206

ISSN=2234-943X

ABSTRACT=<p>Proliferating trichilemmal tumor is a very rare benign tumor that has the potential to transition into a malignant tumor. PTT most commonly affects the scalps of women above 60 years old and is frequently misdiagnosed due to its rarity. Herein, we present a case of a 68-year-old man with a malignant proliferating trichilemmal tumor on his right thumb. X-ray image showed a soft tissue mass on his thumb accompanied by bone destruction, while <sup>18</sup>F-FDG PET revealed a hypermetabolic mass in the first index with axillary lymph node metastasis.</p>