“…It has been proposed that the nodules may represent an abnormal immune response to infectious agents, such as tuberculous bacilli and histoplasma organisms, or autoimmune process, since many immune-mediated diseases appear in concordance with PHG [1, 2, 4, 5, 7, 8]. There have been reports of patients who were previously exposed to fungal or mycobacterial diseases prior to contracting PHG [6].…”