Um, parts list?
Not going to be very many ATX capable cases with significantly reduced volume. Kind of the point of having Micro ATX and Mini ITX.
Certainly a few that offer little to no cable management that are thinner, some with power supplies mounted in the front so they are shorter (rather than over or under the motherboard) Desktop chassis where the motherboard lays flat. These cases tend to have a short height but large foot print.
So many ways to handle this.
Simplest would be to replace the motherboard and get an ITX case.