FLCN and Spontaneous pneumothorax: Birt–Hogg–Dubé syndrome (BHD) is an autosomal dominant disorder first reported in 1977, caused by a mutation in the folliculin (FLCN) gene on Chromosome 17 and characterized by benign cutaneous fibrofolliculomas in the head and neck, pulmonary cysts, spontaneous pneumothorax, and combined renal tumors [1, 2].