The present thesis initiallydescribes a disease resembling sarcoidosis. A retrospective data analysis was used to evaluate the clinical symptoms, the body plethysmography, thoracal imaging, the CD4+/CD8+ ratio in BAL fluid and the therapy of a group of patients who first presented themselves with a suspected disease resembling sarcoidosis between January 2010 and April 2013.80 patients with a roentgen stage of 0 were assigned to core group 1, another 27 patients with roentgen stages of I to IV were assigned to core group 2.The results show that the patients of core group 1 suffered especially from fatigue, but also from coughing and dyspnoea. No correlation was found to the lung function parameter VC. An increased CD4+/CD8+ ratio in BAL was present in all patients of core group 1. The patients of core group 2 mostly fulfilled the criteria of sarcoidosis, due to the corresponding radiographic changes and the evidence of non-caseating granulomata of epithelioid cells. Fatigue was observed less often than in core group 1. In summary, the present thesis succeeds in initially describing a disease resembling sarcoidosis, characterized by the clinical triad of coughing, dyspnoea and fatigue, as well as an increased CD4+/CD8+ ratio in BAL and a radiographic stage of 0. In contrast to sarcoidosis, histologic evidence of non-caseating granulomata of epithelioid cells is missing.