Size 550cc or 600cc

I think a lot depends on the circumference of your ribcage and width and height of your breasts/implants as well as your body proportions. Do you know how much breast tissue they removed during the mastectomy? That can be a helpful baseline. I was a large C/small D before mastectomy but they were pretty wide and a bit droopy. They removed about 530 ccs of tissue from each side during the mastectomy and put in 550 cc silicone implants in a moderate plus profile. The shape is slightly different than the originals though -- rounder, perkier, narrower, less droopy, maybe slightly less projection but slightly "fuller." I am able to wear the same bras and tops that I wore before the surgery and would say I am a full C. The best part is being able to go braless sometimes. Good luck and I hope this helps.

50ccs is the equivalent of 3 tablespoons - unlikely to make a discernible size difference when spread across the entire implant. I have had a 600cc implant, a 500cc implant and a 445cc implant and wore the same bra with all three.