Medical milestones, landmark publications, and notable births and deaths associated with April 20.

Events

No major medical milestones added for this date yet — this page is being expanded

---

Births

No major medical milestones added for this date yet — this page is being expanded

---

Deaths

1750 – Jean-Louis Petit (1674-1750), French surgeon; described the Petit-type tourniquet (1718) and provided the earliest description of Colles fracture (1705)

1879 – Adolphe-Marie Gubler (1821-1879), French physician; described Millard-Gubler syndrome (1856) and Gubler’s line

1924 – Mary Clayton Holt (1924-1993), English cardiologist; described Holt-Oram syndrome (1960)

1963 – Pierre Le Damany (1870–1963), French physician; described Signe de Le Damany (1912)

1966 – Rufus Ivory Cole (1872-1966), American physician; described Cole-Cecil murmur (1908)

2006 – Ida Bianco Silverstroni (1917-2006), Italian physician; described Silvestroni-Bianco anaemia (1948)

---

Further reading