Patti,
My thyroid surgery was 4 yrs before diagnosis of AN so unrelated in that aspect although it is entirely possible I HAD the AN then and just did not know it yet. I developed cancer in a thyroid nodule I had so had to have thyroid removed.. I did start a thread a while back about parathyroid correlation wondering if anyone else had had a parathyroid adenoma removed.. the Mayo Clinic website lists this as a "possible" risk factor of AN and I had had that removed during thyroidectomy. all three "things" were coincidentally on the right side of my head/neck.. strange,, huh?? but as Jim says, I know of no other "studies" etc. concerning this issue,, just kinda strange occurrences.. best of luck with your surgery! by the way, I did develop a sore throat/sinus issue the week of my surgery and called my surgeon to make sure he did not want to put off surgery ( as I had totally psyched myself up to "get on with it") and he did put me on an antibiotic for the few days before surgery. .. so if you don't get feeling better, you may just want to call and ask if meds are needed before surgery... again, good luck