CEA test: Carcinoembryonic antigen test is to detect response to therapy in cancer patients, especially colon cancer, with normal range of less than 2.5 (less than 5 in heavy smokers). Note that a positive test may not always be indicative of cancer.
Os Trigonum Syndrome. An Os Trigonum is a small, extra bone found at the back of the ankle in approximately 5-10% of people. Often it goes completely unnoticed, not causing any problems.
See also: History of astrology. Along with Scorpio and Pisces, Cancer forms the Water Trigon. The Water Trigon is one of four elemental trigons, fire, earth, air, and water. When a trigon is influential, it affects changes on earth. Cancer is said to be the house of Neptune and the exaltation of Jupiter, both astronomical bodies having influence over those born under Cancer. In Vedic astrology the sign has name Karka and its Lord is Moon.