La mastectomie préventive est une intervention chirurgicale destinée à diminuer fortement le risque de cancer du sein. Cette opération consiste en l’ablation des deux seins et s’accompagne d’une reconstruction mammaire généralement réalisée pendant le même temps opératoire. Elle est quasi-exclusivement proposée aux femmes porteuses de mutations d’un des gènes BRCA1 ou BRCA2, et qui ont donc une grande probabilité de contracter un cancer.

In this image, NASA astronaut Rex Walheim works outside the new Columbus lab shortly after it was installed in Feb. 2008.

NASA astronaut Robert Curbeam works on the International Space Station's S1 truss during the space shuttle Discovery's STS-116 mission in Dec. 2006.

Lunar crater is named after former NASA chief exploration scientist.

This image shows NASA's InSight lander after it was commanded to deploy its solar arrays to test and verify the exact process that it will use on the surface of the Red Planet.

This image of Jupiter’s swirling south polar region was captured by NASA’s Juno spacecraft as it neared completion of its tenth close flyby of the gas giant planet.

A new analysis of about 10,000 normal Sun-like stars in the Milky Way's galactic bulge reveals that our galaxy's hub is a dynamic environment.

Sunrise as seen from the International Space Station. "A view of the sunrise from the ISS is a perfect start to a new day," so said @Anton_Astrey, otherwise known as cosmonaut Anton Shkaplerov, a member of the Expedition 54 crew aboard the International Space Station, orbiting 250 miles above the Earth.

Saturn’s rings, made of countless icy particles, form a translucent veil in this view from NASA’s Cassini spacecraft.

THE OSIRIS-REx mission, which will map and return samples from asteroid Bennu, is expected to reach the asteroid in August, 2018. This composite image of the Earth and Moon is made from data captured by OSIRIS-REx's MapCam instrument on Oct. 2, 2017, when the spacecraft was approximately 3 million miles from Earth.

Due to its unique evolutionary status, Cassiopeia A (Cas A) is one of the most intensely studied of these supernova remnants.

The Aug. 21, 2017, total solar eclipse was rare in its long, uninterrupted path over land, which provided scientists with a rare chance to investigate the Sun and its influence on Earth in ways that aren’t usually possible. On Dec. 11, researchers discussed initial findings based on observations gathered during the eclipse.

During an engineering flight test of the Cloud-Aerosol Multi-Angle Lidar (CAMAL) instrument, a view from NASA Armstrong Flight Research Center’s ER-2 aircraft shows smoke plumes, from roughly 65,000 feet, produced by the Thomas Fire in Ventura County, California, around 1 p.m. PST on Dec. 5th, 2017.

NASA astronaut Randy Bresnik photographed Orbital ATK's Cygnus cargo spacecraft at sunrise, prior to its departure from the International Space Station at 8:11 a.m., Dec. 6, 2017. Expedition 53 Flight Engineers Mark Vande Hei and Joe Acaba of NASA gave the station's Canadarm2 robotic arm the command to release Cygnus.

The Hubble Space Telescope peers into the distant universe to reveal a galaxy cluster called Abell 2537.

Dellingr is a shoebox-sized spacecraft built to show that CubeSat platforms could be cost-effective, reliable and capable of gathering highly robust science.

Orbital ATK's Cygnus resupply ship with its cymbal-ike UltraFlex solar arrays approaches the International Space Station on Nov. 14, 2017.

On November 9, 1967, the uncrewed Apollo 4 test flight made a great ellipse around Earth as a test of the translunar motors and of the high speed entry required of a crewed flight returning from the Moon.

As Cassini hurtled toward its fatal encounter with Saturn, the spacecraft turned to catch this final look at Saturn's moon Pandora next to the thin line of the F ring.

This Hubble infrared image is part of an observing program that imaged 41 massive galaxy clusters to find the brightest distant galaxies for theJames Webb Space Telescope to study.

Saturn's graceful lanes of orbiting ice -- its iconic rings -- wind their way around the planet to pass beyond the horizon in this view from NASA's Cassini spacecraft.