Heart and circulatory system

Mammogram for breast cancer - What to expect

Watch video to see what it's like to have a mammogram, or breast cancer detection exam.

Roux-en-Y gastric bypass surgery

In this type of gastric bypass, the surgeon creates a small pouch at the top of the stomach, greatly limiting the amount of food the stomach can hold.

Diabetes mellitus - retinal conditions

This animation depicts changes to the retina resulting from diabetes mellitus.

• Diabetes
• Vision

Macular degeneration

This animation shows the process of macular degeneration in the eye. The macula is the part of the retina that distinguishes fine details at the center of the field of vision. Macular degeneration results from a partial breakdown of the insulating layer between the retina and the choroid layer of blood vessels behind the retina. Macular degeneration results in the loss of central vision only.

• Vision

Causes of endometriosis

Animation of endometriosis as it develops and causes tissue damage in a woman's reproductive tract.