有关结节病(肉样瘤病)流行病学的研究几乎没有提及发病的季节性问题。Hosoda等在日本1963～1972年间诊断为结节病的一组678例患者中注意到,每年6～7月时病例明显增加。而Henke等发现在美国罗彻斯特居民中,本病无明显的季节性增加,Poukkula等则证明在芬兰Oulu的354例一组病例中,64％是在上半年确诊的。 Epidemiological studies on sarcoidosis (sarcoidosis) have rarely mentioned the seasonal problem of onset. Hosoda et al., In a group of 678 patients diagnosed as sarcoidosis in Japan between 1963 and 1972, noticed a significant increase in cases from June to July each year. However, Henke et al. Found no significant seasonal increase of this disease among Rochester residents in the United States. Poukkula et al. Demonstrated that 64% of 354 patients in a group of 354 patients in Oulu, Finland were diagnosed in the first half of the year.