BUENOS AIRES, Argentina–A 38-year-old former Miss Argentina has died from complications after undergoing cosmetic surgery on her buttocks.

Solange Magnano, a mother of twins who won the crown in 1994, died of a pulmonary embolism Sunday after three days in critical condition following a gluteoplasty in Buenos Aires.

Gluteoplasty involves placing implants in the buttocks to make them appear rounder.

Fashion designer and friend Roberto Piazza said the procedure also involved injections, and the liquid "went to her lungs and brain."

"A woman who had everything lost her life to have a slightly firmer behind," he said.

Magnano's burial Monday was shown on Argentine television.

Dr. Gonzalo Cortes y Tristan said she arrived at his hospital with an acute respiratory deficiency. Her condition deteriorated until she suffered the embolism.

Juan Carlos Seiler, former president of the Buenos Aires Association of plastic surgeons, told the Times of London that the doctor who performed the procedure might not have been "a real professional."