He realized that the brat was actually the protagonist of the novel.

He was known as a quack doctor in that town.

He was taken to the operating room.

She decided to undergo facial reconstructive surgery.

She decided to have plastic surgery to gain confidence.

Even though he is a doctor, he doesn't take care of his own health. It's truly a case of 'physician, heal thyself'.

My younger brother had an appendectomy yesterday.

He decided to undergo sex reassignment surgery.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

Well then, I'm off.