ACys amyloidosis is a rare form of amyloidosis caused by the accumulation of abnormal proteins called amyloid-Cys (ACys) in the body's organs and tissues. It is a progressive, degenerative disorder that can affect multiple organs and systems, incl...

Adamantinoma is a rare type of malignant bone tumor that usually affects the long bones of the legs. It is characterized by the presence of a unique type of bone tissue called adamantinomatous tissue. This type of tumor is slow-growing and can be ...

Adams Oliver Syndrome (AOS) is a rare genetic disorder characterized by the absence of the scalp, skull bones, and the underlying brain tissue. It is also associated with limb defects, such as missing or malformed fingers and toes. Other features ...

ADan amyloidosis is a rare, progressive, and fatal disorder caused by the accumulation of abnormal proteins called amyloid in the body's organs and tissues. It is caused by mutations in the gene that produces transthyretin (TTR), a protein that tr...

ADCY5-Related Dyskinesia is a rare neurological disorder caused by mutations in the ADCY5 gene. It is characterized by involuntary, repetitive movements of the face, trunk, and limbs. Symptoms usually begin in childhood and can range from mild to ...

What Is Tobacco Addiction? When people are addicted, they have a compulsive need to seek out and use a substance, even when they understand the harm it can cause. Tobacco products -- cigarettes, cigars, pipes, and smokeless tobacco -- can ...

What Is Tobacco Addiction? When people are addicted, they have a compulsive need to seek out and use a substance, even when they understand the harm it can cause. Tobacco products -- cigarettes, cigars, pipes, and smokeless tobacco -- can ...

Addison disease, also known as primary adrenal insufficiency, is a rare disorder that occurs when the adrenal glands do not produce enough of the hormone cortisol and, in some cases, the hormone aldosterone. Symptoms of Addison disease can include...

Addison's disease, also known as primary adrenal insufficiency, is a rare disorder of the adrenal glands. It occurs when the adrenal glands do not produce enough of the hormone cortisol and, in some cases, the hormone aldosterone. Symptoms of Addi...

Adducted thumbs-arthrogryposis syndrome, Christian type is a rare genetic disorder characterized by the presence of adducted thumbs, joint contractures, and other physical abnormalities. It is caused by a mutation in the HOXD13 gene and is inherit...

Adenine phosphoribosyltransferase deficiency (APRT deficiency) is an inherited disorder caused by a deficiency of the enzyme adenine phosphoribosyltransferase (APRT). This enzyme is involved in the breakdown of adenine, a component of DNA and RNA....

Adenocarcinoma of the gallbladder and extrahepatic biliary tract is a type of cancer that affects the gallbladder and the bile ducts outside of the liver. It is a rare form of cancer that is usually diagnosed in people over the age of 60. Symptoms...

Adenohypophysitis is a rare autoimmune disorder that affects the pituitary gland. It is characterized by inflammation of the pituitary gland, which can lead to a decrease in the production of hormones that regulate growth, metabolism, and other bo...

Adenoid basal carcinoma of the cervix uteri is a rare type of cervical cancer. It is a slow-growing cancer that is usually found in women over the age of 50. It is characterized by the presence of cells that look like basal cells, which are the mo...

Salivary gland type malignant neoplasm arising from bronchial seromucinous glands. Composed of epithelial and myoepithelial cells in cribriform, tubular and solid growth patterns....

Adenoid cystic carcinoma (ACC) is a rare type of cancer that develops in the salivary glands, the glands that produce saliva. It is a slow-growing cancer that can spread to other parts of the body, such as the lungs, bones, and lymph nodes. Sympto...