Articles

  • Disease

    Abscess

    An abscess is a collection of pus in any part of the body that, in most cases, causes swelling and inflammation around it.

  • Disease

    Abscess - abdomen or pelvis

    CT scan of the pelvis showing a large intra-abdominal mass.

    An abdominal abscess is a pocket of infected fluid and pus located inside the belly (abdominal cavity). This type of abscess can be located near or inside...

  • Test

    Abscess scan - radioactive

    Radioactive abscess scan looks for abscesses in the body using a radioactive material. An abscess occurs when pus collects due to an infection.

  • Disease

    Absence seizure

    The central nervous system is comprised of the brain and spinal cord. The peripheral nervous system includes all peripheral nerves.

    An absence seizure is the term for a type of seizure involving staring spells. This type of seizure is a brief (usually less than 15 seconds) disturbance of...

  • Disease

    Absent menstrual periods - primary

    Primary amenorrhea is the absence of the menstrual period by the age of 16. Treatment of amenorrhea may range from hormonal supplementation for developmental abnormalities of the reproductive system to surgery for tumors of the pituitary.

    Absence of a woman’s monthly menstrual period is called amenorrhea. Primary amenorrhea is when a girl has not yet started her monthly periods, and she: Has...

  • Disease

    Absent menstrual periods - secondary

    Secondary amenorrhea is the cessation of menstrual flow for a period of 6 months or more in the absence of pregnancy, breastfeeding or menopause. Extreme weight gain or loss, certain medications, as well as anxiety can be the root cause of amenorrhea. Treatment can range from behavior modification for excessive exercise to medication to surgery in the presence of disease.

    Absence of a woman’s monthly menstrual period is called amenorrhea. Secondary amenorrhea is when a woman who has been having normal menstrual cycles stops...

  • Disease

    Absent pulmonary valve

    Tetralogy of Fallot is a birth defect of the heart consisting of four abnormalities that results in insufficiently oxygenated blood pumped to the body. At birth, infants may not show the signs of the cyanosis but later may develop episodes of bluish skin from crying or feeding called "Tet spells".

    Absent pulmonary valve is a rare defect in which the pulmonary valve is either missing or poorly formed. Oxygen-poor blood flows from the heart to the lungs...

  • Disease

    Acanthosis nigricans

    This photograph demonstrates the hyperpigmented, brownish, velvety lesions of acanthosis nigricans. This skin condition may occur in skin folds such as the axilla (armpit - pictured here), neck, and other areas. In adults, it may be associated with hormonal problems, internal malignancy, obesity, and drugs.

    Acanthosis nigricans (AN) is a skin disorder in which there is darker, thick, velvety skin in body folds and creases.

  • Test

    ACE blood test

    Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand. A needle is inserted into the vein, and the blood is collected in an air-tight vial or a syringe. Preparation may vary depending on the specific test.

    The ACE test measures the level of angiotensin-converting enzyme (ACE) in the blood.

  • Self-Care Instructions

    ACE inhibitors

    Angiotensin-converting enzyme (ACE) inhibitors are medicines. They treat heart, blood vessel, and kidney problems.