van der Woude syndrome (MONDO_0019508, a Monarch Disease Ontology id) (VWS) is a rare congenital genetic dysmorphic syndrome characterized by paramedian lower-lip fistulae, cleft lip with or without cleft palate, or isolated cleft palate. Also known as: VWS, cleft lip/palate with mucous cysts of lower lip, lip-pit syndrome.