How is thymus gland removed?

Answer 1

In humans, I don't think it is - it is necessary for autonomous regulation of body temperature, as well as other things I think.

Answer 2

The thymus gland typically "involutes" or essentially disappears in the late teens or twenties.

If you are older, and are having neuromuscular problems, AND your docs have seen a thymus shadow on chest x-ray, your doctors may want to remove it (thymectomy), which in many cases alleviates some of the symptoms of myasthenia gravis. Some surgeons would split the mediastinum down the middle (median sternotomy-same approach as cardiac bypass), but I imagine these days there may be some medical centers that take an endoscopic approach.