Magnetic resonance imaging (MRI) uses a large magnet, radiofrequencies, and a computer to make detailed pictures of organs and structures within the body. It is used to diagnose health problems.

Magnetic resonance imaging (MRI) is a test that uses a large magnet, radio signals, and a computer to make images of organs and tissue in the body. In this case, the heart is imaged. MRI may be used instead of a CT scan when organs or soft tissues are being studied.

Magnetic resonance imaging (MRI) uses a large magnet, radiofrequencies, and a computer to make detailed images of organs and structures within the body, in this case, the brain and spine. MRI is used to help diagnose a health problem.

A mammogram is way to look at your breast using X-rays. It is used to find and diagnose breast disease in women. Read on to learn more details about when and why to get a mammogram, and what you can expect when having it done.

A mastectomy is surgery to remove a breast. It is part of treatment for breast cancer. Here's what you need to know about this procedure.

A mediastinoscopy is a procedure used to examine the mediastinum. This is the space behind the breastbone (sternum). Read on to learn more about the procedure, and what to expect.

A muscle biopsy involves removing a small piece of tissue to diagnose disease. The tissue is usually removed using a needle.

A myelogram is a diagnostic imaging test generally done by a radiologist. It uses a contrast dye and X-rays or computed tomography (CT) to look for problems in the spinal canal. Problems can develop in the spinal cord, nerve roots, and other tissues. This test is also called myelography.