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An arachnoid cyst is a fluid-filled sac of the brain or spinal cord. It forms between the brain or spinal cord and the arachnoid membrane. An arachnoid cyst contains cerebrospinal fluid (CSF). These cysts appear most often in children, but they may also occur in adults.

A Baker's cyst (popliteal cyst) is a fluid-filled sac that forms behind the knee.

Benign paroxysmal positional vertigo (BPPV) is a problem with the inner ear. BPPV causes a feeling of spinning. It is a common problem of the vestibular system.

Here are step-by-step images that show how to brush your teeth.

Here are pictures that show the steps of brushing your teeth with braces.

This is a type of surgery to replace a damaged hip joint. The surgery is done by an orthopedic surgeon.

Turf toe is a sprain of the largest joint of the big toe. It happens when the toe bends up too far. This can happen when pushing off the foot to run.

Trabeculectomy is a type of eye surgery done in the front part of the eye. It’s done to treat glaucoma by draining some fluid from the eye. If you have glaucoma, fluid can drain too slowly. This can cause the pressure in your eye to increase. More pressure is then placed on the optic nerve. This surgery helps to lower pressure inside the eye.

A vitrectomy is a type of eye surgery to treat problems with the retina and vitreous. During the surgery, your eye healthcare provider removes the vitreous and replaces it with another solution.