Takamura Nariaki, Amo Kenichi, Yusa Yu, Takezawa Yusuke
Department of Plastic and Reconstructive Surgery, Japanese Red Cross Ishinomaki Hospital, Miyagi, Japan.
Department of Plastic and Reconstructive Surgery, Tohoku University Hospital, Miyagi, Japan.
J Plast Reconstr Surg. 2023 Jul 31;3(1):21-25. doi: 10.53045/jprs.2022-0044. eCollection 2024 Jan 27.
Trichilemmal cysts are the most common benign subcutaneous cysts on the scalp. Approximately 90% of trichilemmal cysts appear on the scalp and have trichilemmal keratinization without a granular layer visible on pathological examination. In addition, proliferating trichilemmal tumors, which occur in 2% of trichilemmal cysts, show local recurrence and ulceration, making them highly locally aggressive and requiring careful differentiation. We report the case of a 56-year-old man with a giant trichilemmal cyst on his forehead. After computed tomography and magnetic resonance imaging, a subcutaneous cyst was suspected and excised, and a pathological diagnosis of trichilemmal cyst was established. This was a rare case as the trichilemmal cyst was not located on the scalp, the most common site, but on the forehead area, and it was exceedingly large, with a maximum diameter of 9 cm.
毛发囊肿是头皮上最常见的良性皮下囊肿。约90%的毛发囊肿出现在头皮上，病理检查可见毛发角化，无颗粒层。此外，2%的毛发囊肿会发生增殖性毛发肿瘤，表现为局部复发和溃疡，具有高度局部侵袭性，需要仔细鉴别。我们报告一例56岁男性前额巨大毛发囊肿的病例。经计算机断层扫描和磁共振成像后，怀疑为皮下囊肿并进行切除，病理诊断为毛发囊肿。此病例较为罕见，因为毛发囊肿并非位于最常见的头皮部位，而是在前额区域，且囊肿极大，最大直径达9厘米。
