When I first looked up types of fibroid tumours - I had one - I found there were three kinds:
1. Ones that grew inside the uterus itself.
2. Ones that grew inside the WALL of the uterus - mine was that, and grew close to 2 lbs.
3. Ones that grow outside the uterus.
The last one sounds like what you had. It would have been pointing out toward the ovary. I think that is what they meant.
I had both an ultrasound and an injected-dye CT scan. Even with the amazing pictures, the surgeon did not know exactly what he was dealing with til he actually got IN there. The uterus was wider than they thought, was harder to get out, and I bled more than expected.
I say that because your surgeon, like all others, didn't know the WHOLE story til your surgery.
Prayers that the hyst WAS necessary for some reason! There might be more answers to the story when the pathology report comes back.
Any idea on the size of the tumour?