Partial or Radical nephrectomy with Chronic kidney disease

I was diagnosed incidentally due to my Chronic Kidney Disease stage 3A. My Dr. Sent me for a renal ultrasound and a 6cm mass was found. Then MRI with contrast and appt with urologist met with surgeon same day. I was not given a choice of a partial nephrectomy. Even though it is less than 7cm the location is mid pole anterior localized mild invasion to renal pelvis. CT scan of chest completely clear. I am asymptomatic. Female 60 yo. I am trying to get a second opinion now before my whole kidney is gone. I do not want to slide fast toward Stage 5 CKD. I can't get a nephrologist appt. Until after the surgery in about 3 weeks. I am hopeful I can get a second opinion by virtual appt. It is the same Baylor Scott and White. I go to the one in Temple, TX where I live. The bigger one is in Dallas medical center with the University of Texas. I want to know I have no choice except radical before I have the surgery. I know of one patient with a large tumor my hospital did a full nephrectomy and it was benign. My best friend had a partial with about 6 cm localized tumor 3 yrs ago renal cell carcinoma. Anyway was hoping someone had a similar situation