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updated 9/20/2012 2:06:14 PM ET 2012-09-20T18:06:14

Observing that women with the most severe form of endometriosis happen to be unusually attractive, researchers in Italy speculate that the qualities that led to the women's good looks also predisposed them to the painful gynecological condition.

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In the study, independent observers rated 31 percent of women with severe endometriosis as attractive or very attractive, while just 8 percent of women with milder endometriosis, and 9 percent of women without the condition were rated that highly.

"Several researchers believe that a general phenotype exists which is associated with the disease," said study researcher Dr. Paolo Vercellini, an obstetrician and gynecologist at Universita degli Studi in Milan.

It may be that a more feminine body type is the result of the same physical characteristics that predispose women to develop severe endometriosis, Vercellini said.

Female attractiveness is linked with higher estrogen levels, and it's possible that the hormone "might favor the development of aggressive and infiltrating endometriotic lesions, particularly in the most feminine subjects," the researchers wrote in their study.

The study was published online Sept. 17 in the journal Fertility and Sterility.

A more feminine silhouette
In endometriosis, cells that normally line the uterus leave the organ and become deposited in other sites within the body, such as on the ovaries, rectum, bladder or pelvic area. These deposits respond the same way as normal uterine cells do to the hormone changes that occur over a woman's monthly cycle — they thicken, and then shrink — which can cause pain in the pelvic region, and bleeding.

Endometriosis is thought to affect 5 to 10 percent of women. The severe form, called rectovaginal endometriosis, is much less common than milder forms, Vercellini said.

In the new study, researchers looked at 100 women with rectovaginal endometriosis, 100 women with less severe endometriosis, and 100 women without endometriosis who were undergoing gynecologic surgery for other reasons. Most of the women in the studies were in their late 20s or early 30s.

Two male and two female doctors who did not know the women's diagnoses met with each woman for a few minutes, and rated her overall attractiveness on a 5-point scale.

Other researchers took measurements of the women, and calculated their body mass indexes, their waist-to-hip ratios, and their "breast-to-underbreast" ratio — a measure of breast size.

Results showed that the women with severe endometriosis had lower body mass indexes, and larger breasts, than those without the disease.

The women also completed a questionnaire about their sexual history, and the results showed that women with severe endometriosis were more likely to have had sexual intercourse before age 18. This could be a result of these women being more attractive, even during adolescence, the researchers said.

One measurement of attractiveness — waist-to-hip ratio — was not different between the groups, the researchers said.

What the findings mean
Previous studies have found that several physical characteristics — such as body size, body mass index, hair color, eye color, skin color and fat tissue distribution — may be different in women with endometriosis than in the general female population, Vercellini said.

This line of research may shed light on the hormones or genes linked with women's risk of developing the uterine condition, the researchers said.

While it's not exactly clear why women with severe endometriosis may be more attractive than others, the hormone estrogen could play a role, the researchers said. Studies have shown that more-attractive women have higher levels of estrogen, and higher levels of the hormone also may be linked with the development of endometriosis.

On the other hand, it could be that the same genes that play a role in women's physical appearance also raise the risk of developing severe endometriosis.

"It is tempting to speculate" that genes that interact with hormones to produce a more feminine appearance may also predispose women to severe endometriosis, Vercellini said. However, the findings are preliminary and need to be verified in further studies, he said.

Vercellini noted that in the study, the attractiveness of the women with mild endometriosis did not differ from that of women without the condition — it was only the women with rectovaginal endometriosis who appeared to be more attractive.

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