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It was especially helpful to hear Rodriguez explain the procedure, called a sleeve gastrectomy, and describe the experiences of other teenagers who had been through it.

Bariatric and metabolic surgery can be performed with a sleeve gastrectomy, which reduces stomach size and decreases hunger, and a gastric bypass, which creates a small pouch to restrict food intake.

"A sleeve gastrectomy is where a large part of the stomach is removed so it's much smaller than it was before," the NHS website says.

It’s not clear from the autopsy report which type of surgery Presley had, though experts said it was not a sleeve gastrectomy, which is the most common procedure.

Wallace, the Brooklyn legal assistant, was billed $60,500 for her lap sleeve gastrectomy, though how much her insurance actually paid remains to be hashed out in court.