- Category : 1880-births
- Type : GP
- Profile : 2/4 - Hermit / Opportunist
- Definition : Split - Small (14)
- Incarnation Cross : RAX Explanation 4
French-born doctor in Quebec, considered one of the leading histopathologists of his era. He is credited with first describing neurocrine secretion and his work led to the development of modern neuroendocrinology. He was also known for his research into brain tumours. Masson developed at three-stain protocol used in histology known as "Masson's trichrome stain". He died on 11 May 1959, aged 78, in Montréal, Canada.