Endo on ultrasound but clear MRI

[KEJ2109]

Hi everyone. I was told back in October, following several ultrasound scans that I have endometriosis, kissing ovaries and cysts. I finally had my MRI last week and last night was in hospital with severe pain and a sensation of movement behind my hip (ovary area) the A&E dr viewed my MRI results and told me there is no endometriosis.

Has anyone had this happen? Why doesn't it show but the ultrasound found a 6cm growth?