Perforated gastric antral ulcer
The few small locules of free intraperitoneal air in the upper abdomen fluid, small extraluminal collection above the gastric antrum, and stranding/inflammation about the porta hepatis is sufficient to confidently diagnose perforated gastric or duodenal ulcer.
To increased diagnostic confidence, the patient was given a small amount of oral contrast and delayed images were taken. This is a great use of oral contrast even in the setting of acute renal injury when intravenous contrast cannot be given. There is an accumulation of high density, extraluminal material outside of the site of perforation and within the hepatic subcapsular space, consistent with free spillage through the ulcer channel. There is also more free intraperitoneal air on the delayed images.
The inflammation of the gallbladder was felt to be reactive, but superimposed acute cholecystitis would also be possible.