"She went to have an ultrasound, and they said there was nothing wrong with her appendix. If there was suspicion of a problem with her urinary or gynecological system, the ultrasound didn't show anything. Later, I found that when my hand pressed below her navel towards the bladder area, she felt discomfort, a kind of pulling pain," Xie Wanying reported her line of thinking. "I suddenly remembered that this area might be related to the urachus. With an ultrasound, unless it's imaged directly at that area, as the teacher said, generally doctors wouldn't suspect this place. If the urinary stones are too small, anything within 1 centimeter can be missed by an ultrasound—only a CT can confirm it. I ultimately suggested that she go get a CT scan of that area to see what's going on."