CREST syndrome is a particular form of a condition called scleroderma. CREST actually stands for the cardinal signs and symptoms associated with the condition:
* Calcinosis (calcium deposits in the hands, particularly)
* Raynaud's phenomenon
* Esophageal dysmotility (difficulty/pain swallowing)
* Sclerodactly (tightness of skin around the fingers and hands)
* Telangiectasias (also called spider veins)
A very nice write up of the condition is available from eMedicine; see the related links section of this answer.
Anterior means "front" portion of the body. A crest is a prominent ridge. For example if you will search for a pelvic bone, you will see that the illium has a "crest." This crest is the top ridge of the pelvic bone.
The iliac crest
The ilaiac crest is the rim of a bone - nothing passes through it.
A crest is a prominent ridge of a bone, a line is a low ridge. For example, search for images of the iliac crest and you will see the crest is the very top portion of the pelvic bone, the line is the lower portion of the medial part of the pelvic bone.
The Koro syndrome is a culture-specific syndrome. The individual with Koro syndrome has an overpowering belief that his or her genitals are retracting and disappearing.
Scleroderma
CREST syndrome
It affects the connective tissue
CREST syndrome is actually a collection of symptoms, not one or two that stand out. Signs can include exhaustion, weakness, difficulty breathing and dizziness.
The crest.
Crest.
Family crest Bird's crest
by measuring the distance from crest to crest
From crest to crest, trough to trough or rest position to rest position
Kari's Crest is the Crest of Light.
The distance from crest to crest in a transverse wave is called a wavelength.
Wavelength.