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.
The lateral tubercle of the talus, when elongated, is referred to as Stiedaâs process (7a,8a). In addition, the lateral tubercle may articulate with a separate ossification center known as the os trigonum (6a). The os trigonum is corticated and articulates with the lateral tubercle via a synchondrosis.