Sarcoidosis is a complex disease and a lot is still unknown. The diagnosis can be difficult. To diagnosis a patient with 100% certainty the presence of granulomas must be established in affected tissue. However, to acquire biopsy material might sometimes be associated with high mortality or morbidity. Furthermore, not all patient respond well to treatment. Especially in rare manifestations of sarcoidosis this is not well investigated. To improve our undertanding of the disease and to improve the diagnostic process and outcome we conduct scientific research.