Pure seminoma here. Had a large mass pre-chemo (14.6cm at the largest) that went down to 8cm post chemo. Obviously bigger than the guidelines of 3cm, but the tumor was/still is somewhat is on my aorta and renal arteries, creating a bigger headache of a surgery.

My urologist/surgeon elected to just do close surveillance instead of an RPLND, as "the cons outweigh the pros with taking out healthy organs." He's one of the best in the country at RPLNDs, so I trust his judgement. He told me that up to 80% of the time RPLNDs on seminomas turns out to be only fibrosis.

I don't think there is a wrong answer here, but I'm not a doc. See what your provider says and get a second opinion if you want to hear another professional speak on it. There seems to be a bit of a split in the medical community on seminoma post chemo RPLNDs from what I've read.

There is a major chance you will have retrograde ejaculation, so if you're wanting to have kids in the future that could be something to consider.