hi and welcome
This is phrase usually used in sonographic description of kidney
caliceal system but also it can be mentioned in ct scan
report. It means that part of kidney that collects urine is enlarged and filled with urine so kidney become enlarged and full of "water". It can be seen in healthy people if there is slower flow of urine or excessive hydration and mostly it isnt indication something worrying. But in some cases it can be sign of ureter
or pelviceal duct obstruction that leads to hydronephrosis
. It can be caused by cysts, inflammation and tumors including metastases. Since you had serious malignant disease,tumor should always be on mind,but pancreatic cancer dont have tendency to recur on kidneys so i dont think that you should worry at this point. Just have frequent ultrasound
check ups and do urine analysis.