TUESDAY, Sept. 7 (HealthDay News) -- The 16-year-old went to the emergency room because of a painful infection in her arm. When doctors used ultrasound on the area, they were shocked to see about 20 foreign objects under her skin, including a paper clip, a screw from a pair of eyeglasses and multiple pieces of pencil lead.
The teen had engaged in "self-embedding," an extreme form of self-injury, in which people -- often adolescents -- deliberately hurt themselves or mutilate their bodies without intending suicide. Self-embedders insert objects made of glass, wood, metal or other materials under the skin.
Determining how many teens "self-embed" is difficult, doctors say. As with other forms of self-harm, such as "cutting" or burning, many teens are ashamed of what they're doing and take steps to conceal their behavior, said William Shiels, a pediatric interventional radiologist at Nationwide Children's Hospital in Columbus, Ohio.
Between 13 percent and 23 percent of U.S. teens have reported intentional self-injury, according to background information in a study by Shiels and colleagues that was released online Sept. 7 in advance of publication in the October print issue of the journal Radiology.
Shiels' team found that of about 600 patients of all ages who went to the hospital to have foreign bodies removed from under their skin, 11 patients, or about 1.8 percent, had intentionally inserted the objects. They ranged in age from 14 to 18, and nine were girls.
The 11 teens had other psychological disorders, including depression, bipolar disorder, anxiety disorder, borderline personality disorder or post-traumatic stress disorder, according to the study.
"One girl told us it's easier to deal with physical pain than the emotional pain in her life," Shiels said. "The reason they cut and embed is an effort to relieve their internal pain, the pain that's ins
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