Is rowing a bad idea for someone with a small aneurysm detected on head ct scan?

Depends: This is a question whose answer is *highly individualized*. The doctor who diagnosed this aneurysm (and is familiar with the rest of your medical history and current medical state) is the one best qualified to give you a good answer to this.

It depends: It depends on where is the aneurism, how big is it, and are there more medical problems, it is best to check with your pcp or neurologist.