Can ureteral calculus go undetected on a USG?

Condition analysis:
Surely. Only about 70 % of ureteric stones are picked up by usg. The only 100 % test is CT scan

Instructions:
Apple Cider Vinegar: Makes your mouth pucker just thinking of it. Some home remedy enthusiasts swear by the use of apple cider vinegar to treat kidney stones. The theory behind it is that apple cider vinegar is made of citric acid that which could play a role in dissolving kidney stones, helping the body pass the stones more easily. In addition, it is believed that apple cider vinegar helps in the prevention of kidney stones to begin with by alkalizing the effect on blood and urine and promoting the production of hydrochloric acid in the body to prevent the formation of kidney stones. Proponents of this home remedy recommend mixing two tablespoons of apple cider vinegar with six to eight ounces of water and drinking the mixture frequently throughout the day, and especially before meal times to help dissolve kidney stones. Drinking ample amounts of fresh water throughout the day is also suggested to help flush the kidneys. If the stones are passed, you are advised to continue drinking this solution one to two times a week to prevent future kidney stones from forming.

Warning: Apple cider vinegar is very acidic and can erode esophagus tissue, destroy tooth enamel and may be dangerous when taken with blood pressure and diabetes medications.