Omphalopagus twins are joined at the front and at the level of the umbilicus.

Commonly involved structures are lower thorax fusion and liver fusion. Pericardium may be common, but the heart is never shared. Stomach and the proximal small intestines are usually separate but the small intestines may join at the level of the Meckel diverticulum. The colon separates distally, and each twin has a rectum. There are four arms and four legs with no pelvic or urinary tract union.

Omphalopagus is difficult to differentiate from thoracophagus on gross survey, the main difference being the absence of cardiac sharing. Omphalopagus twins are the ones with the best chance of survival post separation.

Diagnosis can be established as early as 8th week of gestation by transvaginal ultrasound. The ideal time for evaluation is between 11th and 12th weeks.

See also

Share article

Article information

rID: 45853
System: Obstetrics
Tag: stubs, refs
Synonyms or Alternate Spellings:

Support Radiopaedia and see fewer ads

Updating… Please wait.

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.