OP here. I finally got the MRI.
My doctor rewrote the order as:
"3T MRI of pelvis with and without contrast. Attention pudendal nerve. To be reviewed by Dr Hollis Potter. Indication: Chronic pelvic pain and PGAD."
I'm not sure that the contrast was necessary, but we figured after all this time and flying halfway across the country, might as well cover all bases. Luckily it was in-network with my insurance. I had a small copay.
I completed the online check-in the day before the appointment. It asked to list previous pelvic surgeries (related and/or unrelated to your current pain) and other treatments I've had, including nerve blocks, trigger point injections, etc, and to go into a bit more detail about my symptoms. There was a detailed questionnaire about the location of the symptoms specific to the pelvic area/lower back. I mention all this because it took a bit longer to complete than the standard pre check-in, so I'm glad I didn't wait til the morning of the appointment! Pretty much everything that I reported about my history in the pre check-in was mentioned on the radiologist report.
------------------------------
One other thing is that when I was finally in the MRI room and I meet the technician who is doing the scan, I asked the technician to verify that Dr Potter would be looking at the images and writing the report, and the tech says no, that some other radiologist Dr _____ will be doing that.
Y'ALL can imagine........I''m like WWWWWHHHHAAAATTTTTT
The technician then re-read the papers in hand and saw what my doctor ordered and said that they would call Dr Potter. So as far I know Dr Potter did do my report because her name is on it. I sure hope so, because with all the logistics and hoops of getting the correct order for the correct MRI with the correct radiologist in a very far away expensive city that I've never been to before..... then finding out that Dr Potter is not doing my
POTTER MRI. NO WAY

So all you folks planning to make this same journey, check and recheck every step of the way that this lady knows you are coming and is actually going to be there!!!
----------------------------
Ok now that THAT is out of the way.....
The radiologist report was available for me to read via the hospital's online patient portal by that afternoon.
Impressions: MRI of the pelvis demonstrates no scar encasement of the pudendal nerves throughout the field-of-view, but there are varices within the pelvic floor coursing at the anteroinferior margin of Alcock's canal, surrounding the vagina, and extending around the bulbospongiosus and ischial cavernosus muscles. The findings could be implicated in mild pelvic venous congestion syndrome.
In the FINDINGS section she describes these varices as "small."
Could these small varices/mild pelvic congestion syndrome cause the symptoms I've experienced for the past 15 years? I have no idea. Apparently they are a fairly common finding on Potter's MRI.
From the bit of research I've done here on the forum since receiving the report, the treatment, embolization of the affected veins, does not produce good results in relieving pain and other symptoms, according to members posting here about their own experiences with pelvic embolization. Even when the varices are larger than mine.
So I don't know that I would go down that road...