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scaly

(skā′lē) [Fr. escale, husk] Pert. to scales or flakes.

scan

(skan) [Ult. fr L. scandere, to read or measure verse] 1. An image obtained from a system that compiles information in a sequence pattern, such as CT scan, ultrasound, or magnetic resonance imaging. 2. Scintiscan.

anatomy s. A detailed scan of a fetus, used to determine the presence of congenital anomalies.

bone s. A nuclear medicine scan that uses short half-life radioactively labeled chemicals to make images of bones and bone diseases, such as occult fractures, osteomyelitis, or tumors. This is esp. useful in delineating osteomyelitis and metastases to the bone.

brain s. Any procedure for imaging the structure and function of the brain.

CAT s. computed axial tomography scan, a colloquial term for computed tomography (CT) scan. SEE: computed tomography.

coronary artery s. ABBR: CAS. A noninvasive diagnostic computed tomography (CT) scan that may identify patients at risk for atherosclerosis and coronary disease episodes by measuring calcium in the coronary arteries.

DEXA s. dual energy x-ray absorptiometry.

dimercaptosuccinic acid s. ABBR: DMSA scan. A radionuclide scan used to determine the size, shape, and location of the kidneys and the presence of any kidney scarring.

PATIENT CARE: The patient receives an intravenous injection of a radiopharmaceutical DMSA that tends to collect in parts of the kidney that work normally. Two to 4 hr after the injection, the patient lies still under a gamma camera, which creates an image of the kidneys by collecting the radiation given off by the injected tracer. Any nonfunctioning (scarred) portion of a kidney and any part of the kidney that is not receiving adequate blood flow from the renal arteries does not take up the tracer.

gamma s. Any radiological technique that relies on the detection of gamma particle-emitting radionuclides. Examples of gamma scans include bone scans, gallium scans, and positron emission tomography scans.

HIDA s. An imaging procedure for evaluating diseases of the liver, gallbladder, and bile ducts. Hydroxy-iminodiacetic acid (HIDA), is injected into the bloodstream. Its excretion through the biliary tract is observed with a scintillation counter in a nuclear medicine laboratory. Normally, HIDA travels from the bile ducts through the cystic duct and into the gallbladder, then out the common bile duct through the sphincter of Oddi into the duodenum. When the flow of bile is obstructed by disease (as by a stone, stricture, or malignancy), the passage of the tracer through the biliary tree is slowed or undetectable. SEE: cholescintigraphy.

Meckel s. SEE: under Meckel, Johann Friedrich (the younger).

milk s. A colloquial term for radionuclide reflux imaging. SEE: under ...

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