A chalazion is a swollen, pain-free lump on the eyelid. It gradually forms when the meibomian gland, a sebaceous (oil) gland, is blocked. A chalazion is sometimes called an eyelid cyst or a meibomian ...

And it can get very red, very painful, and large within a day or two. It can even get large enough to close the eyelid. Elliot Levine, MD It could be on the upper lid, it could be on the lower lid.

The standard surgery to clip an aneurysm involves performing a craniotomy, where surgeons make a large incision in the head ...

About one in 50 people in the U.S. have unruptured brain aneurysms. These “ticking time bombs” can rupture if they aren’t treated. Now — doctors are using a novel approach to clip the aneurysm — so ...