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.
Cramped toes can occur for any number of reasons, such as muscle weakness, an os trigonum (an extra bone in the back of the ankle), an electrolyte imbalance, or mineral deficiency. The talus/os trigonum synchondrosis appeared intact, although subchondral erosions were present along the articular margins (Figure 1).