Situs ambiguus is a medical term that refers to an anatomical variation in the location of internal organs, where the organs are not in their usual position. Synonyms for this term include heterotaxy, situs inversus, and mirror-image arrangement. Heterotaxy is a broad term that refers to any type of malposition of visceral organs, whereas situs inversus specifically refers to a complete transposition of organs that are located on the opposite side of the body. The mirror-image arrangement describes the organs being oriented in a reversed position, comparing to the normal anatomical position. These synonyms are essential in the medical field to facilitate communication and ensure accurate diagnoses, helping healthcare professionals provide the right treatment for patients.