“…However, other infections, such as tuberculosis, aspergillosis, blastomycosis, and cryptococcosis can also cause granulomatous FM, as can sarcoidosis [7][8][9][10][11]. Nongranulomatous FM is considered an idiopathic reaction to different autoimmune syndromes, radiation therapy, Behçet disease, or treatment with methysergide [12][13][14][15][16]. Interestingly, some patients with idiopathic FM frequently have other disease manifestations such as retroperitoneal fibrosis, sclerosing cholangitis, or Riedel's thyroiditis, all of which have been associated with the IgG4-related disease (IgG4-RD) spectrum [12,[17][18][19].…”