NTRK1 and infection: As reported in the literature radiotherapy, local infection (worm, helicobacter pylori), allergic reaction, autoimmune processes, or excessive host response to an unknown stimulus have all been described as possible causes of IFP development.[2,11,12] Some studies suggest IFP is a benign neoplasm driven by activating mutations in the tyrosine kinase receptor PDGFRA, and there are usually oncogenic PDGFRA mutations with a certain degree of familial aggregation.[13,14] Regrettably, we did not perform a gene mutation analysis for the 2 cases.