Case Report: Comprehensive management of trichilemmal carcinoma of the lower leg in an elderly patient with comorbidities: a case study on integrated ALA-PDT and surgical excision - Hu, Chan; Liu, Xiaojing; Wu, Mingshun; Liao, Caihe; Zhao, Yan; Xu, Mingyuan; Lai, Yongxian; Zhang, Guolong (Frontiers in Medicine, 2025)