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A brain tumor is a mass or growth of abnormal cells in your brain or close to your brain. Many different types of brain tumors exist. Some brain tumors are noncancerous, or benign, and some brain tum...

A brain lesion is an abnormality seen on a brain imaging test, such as an MRI or CT scan. A brain lesion may involve small to large areas of your brain, and the severity of the underlying condition m...

Hydrocephalus is the buildup of fluid in the cavities (ventricles) deep within the brain. The excess fluid increases the size of the ventricles and puts pressure on the brain. Cerebrospinal fluid norm...

Traumatic brain injury occurs when an external mechanical force causes brain dysfunction and usually results from a violent blow or jolt to the head or body. An object penetrating the skull, such as a...

Trigeminal neuralgia is a chronic pain condition that affects the trigeminal nerve, which carries sensation from your face to your brain. If you have trigeminal neuralgia, even mild stimulation of you...

An intracranial hematoma is a collection of blood within the skull, most commonly caused by rupture of a blood vessel within the brain or from trauma, such as a car accident or fall. The blood collect...

Pituitary tumors are abnormal growths that develop in your pituitary gland. Some pituitary tumors result in too many of the hormones that regulate important functions of your body. Some pituitary tum...

Carpal tunnel syndrome is a condition that causes numbness, tingling and other symptoms in the hand and arm. Carpal tunnel syndrome is caused by a compressed nerve in the carpal tunnel, a narrow pass...

The peroneal nerve is a branch of the sciatic nerve in the lower leg and can be damaged from trauma or injury to the leg or pressure on the leg. Symptoms include loss of sensation, inability to hold t...

A nerve biopsy is a surgical procedures to collect and test a sample of abnormal tissues. The biopsy sample is examined in the lab under a microscope. Biopsy results can help the care team determine a...