Some women want flat chests after mastectomy. Some surgeons don’t go along.

During her training as a breast surgeon, Deanna Attai, an associate professor at UCLA’s David Geffen School of Medicine, read studies and heard mentors say that women who opted against breast reconstruction after a mastectomy generally had a lower quality of life.

But Attai found that didn’t jibe with what she was had been seeing online in the past few years: Facebook groups with names such as “Not Putting on a Shirt” and “Flat and Fabulous” that included many hundreds of women’s happy stories — and photos — about their choice to have an “aesthetic flat closure,’’ the term used by the National Cancer Institute starting in 2020, and forgo breast reconstruction.