GRAPHIC eggtopsy: what stage?

[albinosilver]

Poor little chick was dead in shell and never even got to pipping. It does look fairly developed though. Can anyone estimate around what day it got to before death? What could have caused such a late death?

 

[lilmillefleur]

Looks like day 18 but I’m no expert.

 

[Kessel23]

It looks like it was around day 18, maybe 19, it has almost fully absorbed the sack and probably only had a few more days to go.