| situs inversus totalis | A condition in which there is complete transposition (right to left reversal) of the thoracic and abdominal organs. The heart is not in its usual position in the left chest but is on the right. Specifically related to the heart, this is referred to as dextrocardia (literally, right-hearted). And the stomach, which is normally in the left upper abdomen, is on the right. In patients with situs inversus totalis, all of the chest and abdominal organs are reversed and appear in mirror image when examined or visualised by tests such as X-ray filming. Situs inversus totalis has been estimated to occur once in about 6-8,000 births. Situs inversus occurs in a rare abnormal condition that is present at birth (congenital) called kartagener's syndrome. (12 Dec 1998) |
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| situs inversus viscerum | A transposition of the viscera, e.g., the liver developing on the left side or the heart on the right. Synonym: visceral inversion. (05 Mar 2000) |
| situs perversus | Malposition of any viscus. (05 Mar 2000) |
| situs solitus | The normal visceral arrangement. (05 Mar 2000) |
| situs transversus | <disease> Condition in which the normal asymmetry of the body (in respect of circulatory system and intestinal coiling) is reversed. Interesting because it occurs in approximately 50% of patients with immotile cilia syndrome, a disorder of ciliary dynein. (10 Oct 1997) |
| sitz bath | Immersion of only the perineum and buttocks, with the legs being outside the tub. Origin: Ger. Sitzen, to sit (05 Mar 2000) |