Is there a way to check multiple macros with an `ifdef?  What I would like is:

`define CASE1
// `define CASE2
// `define CASE3

// what I want to do next is
`if defined(CASE1) || defined(CASE2)
// do something
`endif


obviously the defined() bit isn't valid, but is there some easy way of doing this?  I suppose I could do:
`ifdef CASE1
`define CASE1_OR_2
`endif

`ifdef CASE2
`define CASE1_OR_2
`endif

`ifdef CASE1_OR_2
//do stuff
`endif

but that seems like an ugly solution.  Is there a nicer way?

Thanks
-Dan