plastic surgery
整形手术

Surgery to remodel, repair, or restore body parts, especially by the transfer of tissue.
成形外科学：对身体部分重塑，修补或恢复，尤指通过组织移植的外科学

transsexual operation
变性手术 (来源：英语电影下载 http://bt.englishcn.com)

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After a successful transsexual operation and a few plastic surgery operations in March of 2004, Liu obtained a new legal identity card as a female. Last December, she participated in China's first ever Miss Artificial Beauty contest and won the best media impression award. (来源：英语e问e答 http://ask.englishcn.com)

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(来源：英语麦当劳－英语杂志 EnglishCN.com)