Q: Karyorrhexis, pyknosis & karyolysis… WHEN DOES WHAT HAPPEN?! What is associated with apoptosis (I thought pyknosis followed by karyorrhexis, but my teacher said pyknosis by definition was oncosis.), and what is oncosis? February 20, 2013October 22, 2013 almenpatologi Cytopathology karyolysis, karyorrhexis, pyknosis Added By: Anna On: April 27th 2011