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.
1. Os Trigonum on MRI 9Impingement of an ostrigonum during plantar flexion (white arrow)9Thickened adjacent posterior capsule (black arrow) Sagittal T1-weighted turbo spin-echo. 1. Os Trigonum on MRI 9Marrow edema within the os trigonum9Increased signal within thickened soft tissues indicating posterior synovitis.