1.   But this is an invasive operation that often leads to sexual impotence, incontinence and carries the danger of complications.

2.   If radiosurgery could be used to blast tumors elsewhere in the body, he reasoned, it might eliminate the need for more invasive operations.

3.   In addition, if complications develop during a minimally invasive operation, the surgeon can always change to the conventional method.

4.   Past studies have shown that patients with fewer blockages recover faster and with much less agony from the minimally invasive operations than from traditional bypass surgery.