What is Antritis?
Well, I have sinus antritis but I'm betting that's not what you have. :) Antrum means roughly 'gateway'. The antrum you were having scoped is the bottom part of your stomach, near the pyloric valve. -itis means inflammation, so antritis is inflammation or irritation of an antrum.
Gastritis is a really general term for 'angry tummy', it means the lining of your stomach or upper intestine is irritated and painful.
hope that helped a bit
(Look ma, using my Latin class *grin*)
Ivy