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III MATERIAL AND METHODS

During the years covered by the present study, 1971-1977, all the patients in whom (a) chest radiography revealed a finding suggesting sarcoidosis, or (b) a possible sarooid manifestation was discovered in medical examination, were referred to the Oulu University Central Hospital or the Paivarinne Hospital, which is a hospital for lung and internal diseases, for a detailed examination to confirm the diagnosis. The diagnosis of sarcoidosis was made con (the basis of typical clinicoradiological findings and verified histologically in every case. The clinico-radiological picture considered typical of sarcoidosis consisted of hypertrophy of hilar glands, symptom-free or with mild general symptoms, possibly associated with pulmonary infiltration. A physician specialised in pulmonary diseases and interested in sarcoidosis reviewed all the chest radiographs. The findings were classified as follows (Wurm et al. 1958):