Hello. welcome to HCM.
There are many causes of granulomas, most of which are non-neoplastic (infective or non infective) and a few may be neoplastic. In the lung, most of the granulomas will be tubercular or sarcoidosis
related granulomas. Other common causes will be :
1. Fungus related
2. Foreign body
3. Other uncommon infections (pneumocystis/ histoplasma/ parasite related)
the cause of granulama decides therapy. Cause is decided based on symptoms/ involvement of other body sites and morphological type of granuloma( caseating or non caseating).
Thus the type needs to be decided to tell you the therapy.If it is tubercular (the most common cause in lung), you need to take ATT for complete duration. If sarcoid (the second most common cause), you need to take approprite therapy (again under guidance of specialist)