There are multiple definitions:

1. Prader-Willi syndrome(English)

   • genetic disorder caused by a loss of function of specific genes on chromosome 15
   • IPW, PWCR, SYS, PWL
   • Congenital disorders, Endocrinology, Diabetes, Adiposity, Neurology
   • https://www.omi…rg/entry/176270
   • https://www.ncb…/books/NBK1330/

2. port wine stain(English)

   • one of the more common birthmarks related to blood vessel growth
   • Dermatology, Vascular disease, Congenital disorders, Laser technique
   • https://birthma…ort-wine-stain/
   • https://www.nej…6/NEJMoa1213507