Are the two sentences both acceptable?

1 and 2 are ok, I think.

Gender reassignment surgery?

Thanks dlowan.

I'd wait to hear others' opinion about the name of the surgery.

I've heard both dlowan's name or transgender surgery.

Thanks Ceili

Cued by your reply I have googled out it is:

Sex Reassignment Surgery
Or:
Sex Change Surgery

******************************
http://www.bangkokplasticsurgery.com/sex-change-surgery.html

What is the Sex Reassignment Surgery (SRS)?

Sex reassignment surgery refers to the administration of surgery to change the sex appearance according to one's sex identity. There are two kinds of surgery.

Genital surgical sex reassignment: surgery of the genitalia and/or breasts performed for the purpose of altering the morphology in order to approximate the physical appearance of the genetically other sex. Non genital surgical sex reassignment: any and all other surgical procedures of non-genitalia or non-breast, conducted for the purpose of effecting a more masculine appearance in a genetic female or for the purpose of effecting more feminine appearance in a genetic male.