Without knowing the exact size of your case i took the size of an above average atx case for worst case scenario and converted it from inches to cm.
https://www.newegg.com/Product/Product.aspx?Item=N82E16811352048
45cm height x 23cm width x 50cm depth (without feet)
The case should fit on the desk in the depth dimension but just barely.
50cm desk = 50cm depth
Now for the other dimensions
As for the monitor 25 inches is 63 cm, too early to do the math for the curve.
Let's just call it 24 inches or 60 cm.
If the case is flat and length-ways on the desk it should fit.
142cm (desk) - 45cm = 97cm of free space
97cm of free space - 60cm monitor = 37cm of clearance.
If the case is standing up and length-ways on the desk it...