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.
Here, we will look at the common causes, symptoms, diagnosis and treatment options as well as other conditions that present with similar symptoms. The talus bone forms part of the ankle joint. As the talus grows during childhood, a small piece of bone develops just behind it, known as the Os Trigonum.