(spot )

1. A small surface area differing in appearance from its surroundings. SYN: macula.
2. Rand omly collected, as in a urine specimen.

ash-leaf s.White macules found on the trunk and extremities of persons with tuberous sclerosis.

Bitot s.

SEE: Bitot spots.

blind s.1Physiological scotoma situated 15° to the outside of the visual fixation point; the point where the optic nerve enters the eye (optic disk), a region devoid of rods and cones.

SEE: scotoma.

blood s.A dried specimen of blood placed on filter paper, used for laboratory analysis, as for congenital metabolic diseases.

blue s.Mongolian spot.

Brushfield s.

SEE: Brushfield spot.

cherry-red s.A red spot visible on the retina of children with sphingolipid disorders, such as Niemann-Pick disease or Tay-Sachs disease. SYN: Tay spot.

cold s.An area on a nuclear medicine scan in which no radioactive tracer is taken up, indicative of nonfunctioning tissue in a gland or other structure.

corneal s.Leukoma.

cotton-wool s.A tiny white infarct with soft or blurred borders in the retina, and present in hypertension, diabetes mellitus, bacterial endocarditis, and other diseases. SYN: soft exudate.

focal s.The area on the x-ray tube target that is bombarded with electrons to produce x-radiation.

Fordyce s.

SEE: Fordyce disease.

genital s.The area on the nasal mucosa that tends to bleed during menstruation.

SEE: vicarious menstruation.

hematocystic s.Any of the focal red marks seen on esophageal varices. They consist of aneurysms of the wall of the dilated blood vessel. Their presence increases the likelihood that the varix may bleed.

histo s.Scarring of the macula found in those infected with Histoplasma capsulatum.

hot s.1An area on the surface of the skin that, when stimulated, experiences a sensation of warmth.2In a nuclear medicine scan, a region of the image that shows an abnormally high concentration of injected isotope.3Any location that has been radioactively contaminated.4In radiation oncology, a tissue region that is exposed to much more radiation than neighboring tissues.

hypnogenic s.Hypnogenic zone.

Koplik s.

SEE: Koplik spot.

liver s.A popular term for a pigmentary skin discoloration, usually in yellow-brown patches.

SEE: Lentigo senilis.

milk s.A dense area of macrophages in the omentum.

mongolian s.Any of the blue or mulberry-colored spots usually located in the sacral region. It may be present at birth in Asian, American Indian, black, and Southern European infants and usually disappears during childhood. SYN: blue spot.

SEE: illus.

rose s.Rose-colored maculae occurring on the abdomen or loins in typhoid fever.

Roth s.

SEE: Roth spots.

ruby s.Cherry angioma.

shin s.The colloquial name for necrobiosis lipoidica diabeticorum. This condition is usually, but not always, associated with diabetes.

SEE: necrobiosis lipoidica diabeticorum.

Tardieu s.

SEE: Tardieu spot.

Tay s.

SEE: cherry-red spot.

Trousseau s.s

SEE: under Trousseau, Armand .

white s.Light-colored, elevated areas of various sizes occurring on the ventricular surface of the anterior leaflet of the mitral valve in endocarditis.

yellow s.

ABBR: y.s.