Researchers from Interphone studied if these four types of brain tumors are related to cell phone use.

Benign or non-cancerous tumors stay in one place and do not spread to other parts of the body. They are almost never life threatening.

Malignant or cancerous tumors do spread and can be life threatening.

ACOUSTIC NEURINOMA:

Acoustic neurinoma is a benign, usually slow-growing tumor that develops from the balance and hearing nerves in the    inner ear.

The tumor comes from an overproduction of Schwann cells, which normally wrap around nerve fibers like onion skin to help support and insulate nerves.

As the tumor grows, it presses against the hearing and balance nerves, usually causing unilateral hearing loss, ringing in the ear, and dizziness.

– Information from National Institute on Deafness and Other Communication Disorder

GLIOMA:

Symptoms of glioma are similar to those produced by other malignant brain         tumors and depend on the area of the brain affected.

Symptoms can include headache,         seizures, memory loss, physical        weakness, loss of muscle control, visual symptoms, language problems, cognitive decline, and personality changes.

These symptoms may change, according to which part of the brain is affected.

– Information from WebMD

MENINGIOMA:

Meningioma forms in the meninges, which are thin layers of tissue that cover the brain and spinal cord. It can form from different types of brain or spinal cord cells.  By irritating the underlying cortex, meningiomas can cause seizures. Localized or nonspecific headaches can be common.

– Information from WebMD

PAROTID GLAND TUMOR:

The parotid glands, the largest salivary glands, are found on each side of the face, just in front of the ears.  About seven out of ten salivary gland tumors start here. Most of these tumors are benign, but the parotid gland is where most malignant salivary gland tumors start.

– Information from Cancer.org