FLCN and Birt-Hogg-Dubé syndrome: Interestingly, there is a distinct group of ‘unclassified/atypical/other FLCN mutated tumors’,59, 60 described also as ‘non‐conventional FLCN mutated tumors’,57 that are found in BHD syndrome and also as sporadic tumours, which are potentially aggressive (Figure 3F).