Sister Pickles just cut open a tomato and it was hollow, the inside wall covered in small bumps. Neither of us has ever seen anything like this.
Some of you most likely know what this is but I did some digging and for those of you who haven't encountered this, here's what I found.
It's not a disease but a condition called "puffiness", caused by improper fertilization and usually occurs when outdoor temperatures are above 90 or below 55. High amounts of nitrogen in the soil can also contribute to puffiness.
You learn something new every day! Hopefully, since it's never happened before and no other tomatoes this year have exhibited it, this is a one-off happening.