All are features of Silico-tuberculosis except
In recent years doubts have risen in the association between silicois and tuberculosis as:

Sputum is rarely AfB+
Children and women of sts do not develop tuberculosis
Post mortem of sts fail to prove existence of tuberculosis
Radilogical evidence of both conditions is similar.
High sputum AFB +ve
Children of such cases do not get disease
Impairement of total lung
Nodular fibrosis