What happened to this egg?

[crealbilly]

Strange egg - anyone got a clue what happened inside the hen to cause this?

 

[Yorkshire Coop]

Looks like corrugated shell. Check out this article ~ https://www.backyardchickens.com/a/common-egg-quality-problems

#13 is all about corrugated shell.

 

[aart]

Could just be a one off, glitch in the shell gland.
How old is bird?
New layers or older ones coming back into, or going out of, lay around molt.

 

[crealbilly]

Could just be a one off, glitch in the shell gland.
How old is bird?
New layers or older ones coming back into, or going out of, lay around molt.

Hen is a little over 1 year old.been several days now and I have not found anymore eggs like this one. Hopefully it was just a one off anomalie.