AMS (atypical measles syndrome): An altered expression of measles, AMS begins suddenly with high fever, headache, cough, and abdominal pain. The rash may appear 1 to 2 days later, often beginning on the limbs. Swelling (edema) of the hands and feet may occur. Pneumonia is common and may persist for 3 months or more.
AMS occurs in persons who were incompletely immunized against measle. This may happen if a person were given the old killed-virus measles vaccine (which does not provide complete immunity and is no longer available); or the person were given attenuated (weakened) live measles vaccine that was, by accident, inactivated during improper storage. Immunization with inactivated measles virus does not prevent measles virus infection. It can, however, sensitize a person so that the expression of the disease is altered, resulting in AMS.
Being atypical, AMS can be confused with other entities including Rocky Mountain spotted fever, meningococcal infection, various types of pneumonia, appendicitis, juvenile rheumatoid arthritis, etc.
- Amsler grid
Amsler grid: While conducting an eye examination, the eye care professional may ask the patient to look at an Amsler grid. This grid is a pattern that resembles a checkerboard. The patient covers one eye and stares at a black dot in the center of the grid. While staring at the dot, the patient may […]
Amusia: The inability to recognize musical tones or to reproduce them. Amusia can be congenital (present at birth) or be acquired sometime later in life (as from brain damage). Amusia is composed of a- + -musia and literally means the lack of music. Also commonly called tone deafness.
Amygdaloid: Like an almond. Almond-shaped. As the amygdaloid nucleus in the brain, a structure that anatomists thought resembled an almond. Amygdaloid is pronounced in three syllables: amyg da loid. From the Greek amydale (almond) + the Greek eidos (like).
Amygdala: 1. The amygdaloid nucleus in the brain. 2. The tonsils. These structures were so named because they appeared to be shaped like an almond. From the Greek amydale (almond) + the Greek eidos (like).
- Amygdaloid nucleus
Amygdaloid nucleus: A small oval structure in the temporal lobe of the brain that is closely connected to the hypothalamus, the hippocampus, and the cingulate gyrus. The amygdaloid nucleus is part of the olefactory and limbic systems and plays a role in the sense of smell, motivation, and emotional behavior. It was named the amygdaloid […]