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Medical Glossary Decoded

A gene on the X chromosome. An X-linked disorder is associated with or caused by a gene on the X chromosome.
High-energy radiation used in low doses to make internal images that help to diagnose diseases and in high doses used to treat cancer.
Tiny (1-2 mm) yellowish plaques that are slightly raised on the skin surface of the upper or lower eyelids.
A condition in which yellowish fatty deposits beneath the skin. They range from very small to up to 3 inches in size. Xanthomas may appear anywhere on the body but are most frequently found on the elbows, joints, tendons, knees, hands, feet, and buttocks.
Abnormally dry skin. Xeroderma can be caused by a deficiency of vitamin A, systemic illness (such as hypothyroidism), overexposure to sunlight, and medication.
Abnormal dryness of the skin, mucous membranes, or conjunctiva (xerophthalmia).
Dry mouth. Xerostomia can be associated with systemic diseases, or it can be a side effect of medication and poor dental hygiene.
The lower part of the breastbone. The xiphoid process has no particular function and ranges in size from minuscule to several inches in length.