Retrospective Cohort Study on the Impact of PDL Treatment History on the Efficacy of HMME-PDT in Treating PWS Children

Inclusion Criteria: * Patients clinically diagnosed with PWS (Port Wine Stain) who were between 1 and 3 years old at the time of their first HMME-PDT treatment. * Patients who, after evaluation by a clinician, are deemed eligible for HMME-PDT treatment and whose guardians have signed an informed consent form. * Patients who have undergone two or more HMME-PDT treatments. ④ Patients with complete basic information and treatment-related information. Exclusion Criteria: * Exclusion of patients with syndromes associated with PWS. * Exclusion of patients with a history of treatments for PWS other than PDL treatment. * Patients with other vascular malformations. ④ Exclusion of patients who have received any other PWS treatment within 2 months prior to HMME-PDT treatment.