Spindle cell mass in pelvis

[Winikor]

I am a 68 yesr old woman. I had a spindle cell mass removed robotically near uterus in 2011 and had a hysterectomy as well. The tumor was sent to John Hopkins and came back as spindle cell neoplasm. No treatment was recommended. 1 year ago I had a diverticulitis attack and when I had a CT scan in hospital,  they told me I had a mass in my right pelvis. 3 Dr's that I've seen feel that this is exactly the same I had in the past.  My gyn oncologist said this is a mass the size of an orange and it would be very dangerous to remove so he decided to watch it. It has grown and my gp feels that I'm making a mistake in waiting.  Spoke to a dr friend who said that since I had a hysterectomy that this now was not a gyn issue, that I should see a colorectal surgeon. Went to see him and he said after an MRI that this tumor may be attached to my colon, bowels and rectum and that he may have to cut part of each of those organs. I am very confused. I went to see another gyn oncologisthe at the Sylvester Comprehensive Cancer Center who said this should come out rather sooner than later and that he would do it robotic. The colorectal surgeon said he prefers to cut so he can see what he's dealing with. What should I do?