PDGFRA and gastrointestinal stromal tumor: We herein report a detailed morphological and immunophenotypical analysis of the diffuse stromal proliferation described in the GI wall in PDGFRA‐mutant syndrome7 and of its relationship with IFP and GIST, by exploiting the exceptional opportunity offered by its remarkable manifestation, together with the presence of these tumours, in an individual from a kindred previously published by the authors.9