Cancer-Related Dictionary

Magnetic Resonance Imaging (MRI) is a non-invasive medical test that physicians use to diagnose medical conditions. It utilizes a powerful magnetic field, radio waves, and a computer to produce detailed pictures of the inside of the body. MRI can be used to examine various parts of the body, including the brain, spine, joints, abdomen, blood vessels, and heart.

"Malignant" is an adjective commonly used in medical contexts, referring to a severe and progressively worsening disease, often cancer. It denotes conditions characterized by uncontrolled growth, induction of damage to surrounding tissues, and the potential to spread to other body organs, causing serious health risks and possibly death.

"Mammary" refers to the bodily system in mammals which produces milk for offspring. Most commonly, it is used to designate the mammary glands, which in females are the breasts. This system is crucial for nourishing newborns and plays a significant role in reproductive health. The word is often used in medical contexts related to lactation and breast health.

A mammogram is a specialized medical imaging procedure used to screen and diagnose breast diseases, primarily cancer, in women. It involves taking X-ray pictures of the breast to detect early signs of cancer, often before physical symptoms develop. Mammograms are recommended annually for women of certain age groups or those with increased risk.

Marginal zone lymphoma is a type of slow-growing non-Hodgkin lymphoma that originates in the marginal zone of lymphoid tissue, which is part of the immune system. It often affects the spleen, lymph nodes, or mucosa-associated lymphoid tissue (MALT) and is characterized by the abnormal proliferation of B-cells.

A mastectomy is a surgical procedure performed to remove one or both breasts, often used as a treatment for breast cancer. The extent of tissue removal can vary, from partial (removing the cancerous part) to total (removing the entire breast). It is a critical decision usually made after considering other treatment options, risk factors, and personal preferences.

Mediastinal lymphoma is a type of cancer that occurs in the lymph nodes located in the mediastinum, the central part of the chest between the lungs. It involves the abnormal growth of lymphocytes, which are a type of white blood cell, and can affect the body's immune system.

Medulloblastoma is a type of aggressive, fast-growing brain cancer that primarily affects children. It begins in the cerebellum, the part of the brain responsible for balance, coordination, and complex intellectual functions. Early detection and treatment are crucial for improving survival rates and outcomes. Despite its severity, advancements in therapy have increased the survival rate significantly.

Melanocytes are a type of skin cells found in the lower part of the epidermis, the top layer of the skin. These cells are primarily responsible for the production of melanin, the pigment that gives skin, hair, and eyes their color. Melanocytes play a crucial role in protecting skin from harmful effects of UV radiation from the sun.

Melanoma is a type of cancer that originates from the pigment-producing cells, melanocytes. Most commonly found in the skin, it can also occur in the eyes (ocular melanoma) or other parts of the body. Melanoma is notorious for its rapid spread and high mortality rate, particularly if not detected early. Sun exposure is a key risk factor, emphasizing the importance of protection and surveillance.

Melanoma in situ is an early form of skin cancer where the malignant cells are confined to the outermost layer of the skin, known as the epidermis. It is the earliest stage of melanoma and is highly treatable when detected early.

Merkel cell carcinoma (MCC) refers to a rare and aggressive type of skin cancer that typically begins in the hormone-producing cells just beneath the skin and hair follicles. It commonly appears as a flesh-colored or bluish-red nodule and usually develops on sun-exposed areas. While MCC can occur at any age, it predominantly affects seniors and those with a weak immune system.

Mesothelioma is a rare, aggressive type of cancer that primarily forms on the protective lining of the lungs, abdomen, or heart. It's typically caused by exposure to asbestos, a microscopic, fibrous mineral. With symptoms often appearing decades after exposure, diagnosis is normally in the later stages, impacting prognosis and treatment options.

Metaplasia is a pathological process where one type of mature cell is replaced by another type within the same category. Usually triggered by stress or damage, metaplasia is generally adaptive and reversible, changing to accommodate to the new environment. However, it can also present initial stages of carcinogenesis if left unnoticed and unmanaged.

Metastasis is a medical term referring to the process by which cancer cells spread from the initial tumor site to other parts of the body via the blood or lymph system, forming secondary tumors or 'metastases'. This ability largely defines a cancer's aggressiveness and has significant implications for treatment strategies and prognosis.

A Microarray is a laboratory tool used to detect the expression of thousands of genes simultaneously. It's a two-dimensional grid where probes (DNA or RNA fragments) are attached. By analyzing the way a sample interacts with these probes, scientists can measure the expression levels of massive quantities of genes, making it a crucial tool in genomics research.

Mitosis is a process of cell division that results in two genetically identical daughter cells developing from a single parent cell. This is a fundamental process for growth, development, and repair in multi-cellular organisms. In essence, mitosis ensures each new cell has the same DNA as the original.

A "Modified Radical Mastectomy" refers to a surgical procedure for breast cancer treatment, where the entire breast, most underarm lymph nodes, and often the lining over the chest muscles are removed, but the chest muscles themselves are preserved. This procedure has lesser physical impact compared to a radical mastectomy, yet still offers extensive therapy for aggressive breast cancers.

Molecular imaging is a type of medical imaging that provides detailed pictures of what is happening inside the body at the molecular and cellular level. This technique is used to visualize the processes in the body, such as how a disease progresses or how a treatment is working.

A "molecular target" refers to a specific molecule within a cell, usually a protein, that is identified as crucial in a pathway of a disease. By designing drugs to interact or interfere with these particular molecules, healthcare providers can potentially inhibit the progression of the disease. This forms the basis of targeted therapies in medical research.

Monoclonal antibodies are laboratory-made proteins that mimic the immune system's ability to fight off harmful pathogens such as viruses. They are specially engineered to target a specific disease-causing agent, enhancing the body's natural responses against the disease. They are used in various therapies including cancer and autoimmune diseases treatments.

Monoclonal gammopathy of undetermined significance (MGUS) is a medical condition where abnormal proteins, called monoclonal proteins or M proteins, are present in the blood. It's typically harmless, but may occasionally lead to serious disorders like blood cancers. MGUS lacks distinct symptoms and is often detected during routine blood tests.

Multiple myeloma is a type of blood cancer that originates from plasma cells, a type of white blood cell responsible for the production of antibodies. In this condition, these cells become malignant, multiply uncontrollably, and accumulate in the bone marrow, interfering with the production of healthy blood cells.

Myelodysplastic syndromes (MDS) refer to a group of diverse bone marrow disorders where the body does not produce sufficient healthy blood cells. As a result, patients with MDS often exhibit anemia, fatigue, frequent infections, and easy bruising or bleeding. It's generally diagnosed in the elderly and could progress into acute myeloid leukemia.