Parrot's sign

Parrot's sign, also known as Parrot's nodes or Parrot's bosses, is an old-fashioned term, referring to the bony prominence noted by Marie Jules Parrot and Jonathan Hutchinson on the skulls of children with congenital syphilis in the 19th century.

Further reading

• Parrot, M.J. (May 1879). "The osseous lesions of hereditary syphilis" (PDF). The Lancet. 113 (2907): 696–698. doi:10.1016/S0140-6736(02)35509-0.