<s>[INST] Would a pelvic mri report a kidney cyst roughly 2.5cm as an incidental finding? Have had further ultrasound since mri which noted this, had many ultrasounds before, cyst on kidney never mentioned. Have history of endometriosis, 6 months post tah and bso, was on started combination hrt post surgery, now changed to oestrogen only? [/INST] Hai, MRI is a high definition advanced investigation tool which help in finding the problem comparing to the ultrasound. Ultrasound can reveal a cyst. Depends on the resolution of the machine and reader it will vary. May be cyst developed between the episode of your last ultrasound and MRI.unless cyst cause pain or discomfort it is hard to rule out. Commonly found during incidental or routine investigation. Thank you hope I answered your query </s>