exstrophy vs extroversion

exstrophy

noun
  • A congenital malformation of the bladder in which the normally internal mucosa of the organ lies exposed on the abdominal wall because of failure of union between the halves of the pubic symphysis and between the adjacent halves of the abdominal wall. 

  • The eversion or turning out of any organ, or of its inner surface. 

extroversion

noun
  • The condition of being inside out, especially in relation to the bladder. 

  • A personality orientation towards others and things outside oneself; behavior expressing such orientation. 

How often have the words exstrophy and extroversion occurred in a corpus of books? (source: Google Ngram Viewer )