• Dong Yun Lee, Kang Min Han, and Jung Soo Yoon.
• Department of Plastic and Reconstructive Surgery, DongGuk University Medical Center, Seoul, South Korea.
• Medicine (Baltimore). 2023 Jun 23; 102 (25): e34035e34035.

IntroductionTrichilemmal cysts (TCs) are common benign cysts that form from the hair follicles in the skin. Proliferating trichilemmal cysts (PTCs) are rare types of TCs characterized by rapid cellular proliferation. Malignant transformation of PTC (MPTC) is a rare adnexal tumor that account for <0.1% of all skin cancers. TCs and PTCs are benign tumors; however, MPTCs grow rapidly and are prone to metastasis.Case PresentationA 77-year-old man was referred to our hospital with a solitary pinkish mass on his left elbow. Trichilemmal carcinoma arising from a PTC was confirmed through excisional biopsy, and wide excision was performed. One month postoperatively, a cystic mass was observed and was suspected to have local recurrence; however, bursitis was confirmed after excisional biopsy. After 1 year of follow-up, the patient maintained an improvement without recurrence or any other surgical complications.ConclusionsIn addition to being a very rare disease, MTPC occurred in the elbow of a man who does not fit the general etiology; therefore, it is considered an interesting case, and we report this case for academic contribution.Copyright © 2023 the Author(s). Published by Wolters Kluwer Health, Inc.

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