<unk>  (also called<unk>  transversus or oppositus) is a congenital condition in which the major visceral organs are reversed or mirrored from their normal positions. The normal arrangement of internal organs is known as<unk>  solitus. Although cardiac problems are more common, many people with<unk>  have no medical symptoms or complications resulting from the condition, and until the advent of modern medicine, it was usually undiagnosed.<unk>  is found in about 0.01% of the population, or about 1 person in 10,000. In the most common<unk> tion,<unk>  totalis, it involves complete transposition (right to left reversal) of all of the viscera. The heart is not in its usual position in the left chest, but is on the right, a condition known as dextrocardia (literally, "right-hearted"). Because the relationship between the organs is not changed, most people with<unk>  have no medical symptoms or complications. An uncommon form of<unk>  is isolated levocardia, in which the position of the heart is not mirrored alongside the other organs. Isolated levocardia carries a risk of heart defects, and so patients with the condition may require surgery to correct them. In rarer cases such as<unk>  ambiguus or heterotaxy,<unk>  cannot be determined. In these patients, the liver may be midline, the spleen absent or multiple, and the bowel malrotated. Often, structures are duplicated or absent altogether. This is more likely to cause medical problems than<unk>  totalis.
Situs inversus
Intestinal atresia
Gastric atresia
Duodenal atresia
Esophageal atresia
Choanal atresia
Gastroschisis
Diaschisis