I had both us and mri for lower abdomen at different offices. doc read us said i have endometriosis. another doc read mri said no. should i trust mri?

It is: difficult to specifically diagnose endometriosis on ultrasound because the findings overlap with other abnormalities. Also, findings can be subtle. Depending on how the MRI was performed, it is possible that subtle ultrasound findings might not be visualized on MRI. So a "normal" MRI might not negate the ultrasound findings at this point. Best course is to see your gyn to put it all together.

Not diagnosed by MRI: The only way to confirm the presence of endometriosis is by direct visualization through video laparoscopy. Only in cases involving the ovaries where endometriosis can cause a so-called "chocolate cyst" to develop can it be seen with imaging studies such as CT, MRI, or ultrasound. However, this accounts for only a small percentage of cases of endometriosis.