Atypical sarcoidosis.

Many atypical forms of sarcoidosis have been described. mediastinum-lung in volvement, observed in 90% of the cases, may cause atypical manifestations: hemoptysis, chest pain, predominant pleural or proximal bronchial involvem ent, Diffuse "unpolished glass" images or air cavities may be observed on t he chest x-ray. A rigorous diagnostic work-up is necessary for these atypic al forms. Pathological confirmation is mandatory: non-caseous tuberculoid g ranuloma, A very wide range of extra-thoracic localizations have been descr ibed with variable clinical manifestations. In cases with no mediastinum-lu ng involvement, pathology data must be confronted with the notion of multip le organ dissemination to reach diagnosis.