"Trochlear apparatus calcification in the orbit is a common asymptomatic incidental finding on CT of the head, found in ~12.5% of patients. The incidence does not increase with age, and there is a slight male predominance 2-4. Some studies have suggested an association with diabetes mellitus in younger patients (especially under 40 years) 3. An association has also been demonstrated with autoimmune disease and elevated ALP 1,2."