Mayo Clinic diet
Learning Center
Masculinizing hormone therapy
Find out more about masculinizing hormonal treatment used to better align the body with a person's gender identity.
Mammogram
Learn what to expect during a breast X-ray exam. Find out about the benefits of mammograms for breast cancer screening, as well as potential risks.
Magnetic resonance elastography
This newer, noninvasive imaging test is used to find out how serious certain liver diseases are.
MRI
Learn more about how to prepare for this painless diagnostic test that creates detailed pictures of the inside of the body without using radiation.
Lung volume reduction surgery
Lung volume reduction surgery helps some people with severe emphysema breathe easier. Diseased lung tissue is removed so the remaining tissue works better.
Lung transplant
Learn what's involved in this major surgery that replaces a diseased or failing lung with a healthy lung, and what you can expect after the procedure.
Lung cancer screening
Doctors recommend lung CT scans to look for signs of lung cancer in current and former heavy smokers. Find out what to expect during lung cancer screening.
Lumpectomy
Learn what to expect from this breast-conserving surgical procedure.
Lumbar puncture (spinal tap)
Learn about lumbar puncture, which removes a sample of cerebrospinal fluid to find infections, bleeding and other conditions. It also is called a spinal tap.
Living-donor transplant
This surgery uses a living donor's organ, such as a kidney or portion of a liver, to replace another person's organ that no longer works properly.
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