MEN1 and bronchial endocrine tumor: The frequency of bronchial NETs (br-NETs) in MEN1 has been reported to range from 3 to 13%, and may even reach 31%, depending on the mode of diagnosis (imaging and/or pathology), with the frequency of histologically proven br-NETs ranging from 4.6 to 6.6% (153, 158, 165–168).