Birt-Hogg-Dubé (BHD) syndrome is a rare, autosomal dominantly inherited genodermatosis characterized by multiple cutaneous hamartomas (namely fibrofolliculomas and trichodiscomas) and increased susceptibility to renal neoplasms, pulmonary cysts, and spontaneous pneumothoraces. It is caused by mutations in the FLCN gene, which encodes a tumor-suppressor protein, folliculin.
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