Kuroda-san’s relays his account of the surgery:

Last Saturday fever and stomach pain.

On monday went to the doctor.

Appendicitis. Appendix 10 times the size of normal and had to be rushed to surgery before it ruptured.

They called the office and asked to adjust schedule as needing emergency surgery.

After surgery taking needed pain killer injections.

Was not able to eat or drink.

Finally able to have water and tea.

Sorry for the inconvenience. I will recover soon!

Sounds like he’ll be out and about soon but hopefully taking it easy. Kuroda-san has had health problems for a while now and it all came to a head with his appendix swelling up. Now it’s been removed he should start feeling better right away.