From NPR:
You might have heard about the case on Wednesday’s Morning Edition.
Twenty-five years ago, a British woman who saw a spot on a tonsil tried to get a better look using a pen and a mirror. She slipped and the pen went down her throat.
Neither the woman’s husband nor her doctor believed her. X-rays at the time didn’t detect the pen. Now, “they are eating their words,” as NPR’s Linda Wertheimer put it.
A CT scan shows she was right. And the woman, 76, had the felt-tip pen removed. Even after all these years without trouble, doctors figured there was a risk the pen could tear a hole in her stomach. Remarkably, the pen still worked.