<s>[INST] I have history of kidney stones and Intercystitis. I had an ultrasound done as I was having pain on my right side an the CT showed only stones in the lower poles of my kidneys. However, the utltrasound found a stone in my right ureter . Why would the CT not see the stone? I have also been passing clumps of mucuos in the mornings. My urine is clear, and the clumps do not have an odor. Any ideas on the mucos? [/INST] Good Day!CT scan are more accurate and sensitive in detecting stones than an ultrasound. Although there are stone compositions that doesn't show up in a CT SCan (e.g indinavir stones).I would suggest doing a urinalysis to check for infection and determine the mucous in the urine. They might be phosphate in the urine and have no clinical significance. If you are diabetic then it might be tissue sloughing off from the ureter and kidneys. Again these are speculation and a urine sample in the laboratory is still the best.I Hope I have answered your question. </s>