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.
When the presence of the unfused bone is combined with an ankle injury, Os Trigonum Syndrome can develop. It is usually caused by either: 1) Over-Use: from repeated plantarflexion (foot pointing downwards). Commonly affects ballet dancers, runners and football players.