<unk>  is a condition in which an orifice or passage in the body is (usually abnormally) closed or absent. Examples of<unk>  include: *Aural<unk> , a congenital deformity where the ear canal is underdeveloped. * Biliary<unk> , a condition in newborns in which the common bile duct between the liver and the small intestine is blocked or absent. * Congenital bronchial<unk> , a rare congenital abnormality * Choanal<unk> , blockage of the back of the nasal passage, usually by abnormal bony or soft tissue. * Esophageal<unk> , which affects the alimentary tract and causes the esophagus to end before connecting normally to the stomach. *Follicular<unk> , degeneration and resorption of the ovarian follicles. * Imperforate anus, malformation of the opening between the rectum and anus. * Intestinal<unk> , malformation of the intestine, usually resulting from a vascular accident in utero. * Microtia, absence of the ear canal or failure of the canal to be tubular or fully formed (can be related to Microtia, a congenital deformity of the pinna, or outer ear). * Ovarian follicle<unk> , the degeneration and subsequent resorption of one or more immature ovarian follicles. * Potter sequence, congenital decreased size of the kidney leading to absolutely no functionality of the kidney, usually related to a single kidney. * Pulmonary<unk> , malformation of the pulmonary valve in which the valve orifice fails to develop. * Renal agenesis, only having one kidney. * Tricuspid<unk> , a form of congenital heart disease whereby there is a complete absence of the tricuspid valve, and consequently an absence of the right atrioventricular connection. * Vaginal<unk> , a congenital occlusion of the vagina or subsequent adhesion of the walls of the vagina, resulting in its occlusion.
Atresia
Retained antrum syndrome
Gastric atresia
Intestinal atresia
Pyloric stenosis
Punctal plug
Duodenal atresia
Hiatal hernia