What’s up with this egg?

[masanders]

Cracked this egg open for breakfast and saw this. What’s up with it? I’m used to a blood spot or two, but this is a first.

 

[staceyj]

Piece of reproductive tract lining?

 

[aart]

Boy that is an odd one, never seen that before.
Did you do any dissecting for further inspection?
Would agree with staceyj, piece of tissue shed from repro tract.