Document Detail

Prenatal ultrasonographic diagnosis of thoracopagus conjoined twins.
MedLine Citation:
PMID:  2696776     Owner:  NLM     Status:  MEDLINE    
Conjoined twins are a rare obstetric event occurring 1/50,000 to 1/60,000 deliveries as a result of incomplete fission of the embryonic disc before the third week of pregnancy. They belong to the monochorionic-monoamniotic type of monozygotic twins and are classified according to the area of union, the most common site being the chest and upper abdomen (thoracopagus). Reported are two cases of thoracopagus twins in which the diagnosis was made prenatally by ultrasound in the second trimester of pregnancy. The most significant ultrasound findings included the demonstration of a single cardiac activity, the inability to separate the fetal bodies at their ventral portion, and a face-to-face fetal position. The pregnancies were allowed to continue until term with no significant prenatal complications, and an elective cesarean section was performed to avoid a traumatic delivery. In both cases the infants died during the first week of life because of cardiorespiratory insufficiency. The ultrasound criteria for the antenatal diagnosis of conjoined twins are reviewed, concluding that the careful ultrasound examination of all identified sets of twins, specially in those cases in which no separating membrane is demonstrated, is the cornerstone in making the prenatal diagnosis. In addition, ultrasound plays a crucial role not only in the diagnosis, but also in establishing the degree of conjoining, which is essential for planning an appropriate obstetrical and perinatal management.
V H Quiroz; W H Sepúlveda; M Mercado; R Bermúdez; R Fernández; J Varela
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Journal of perinatal medicine     Volume:  17     ISSN:  0300-5577     ISO Abbreviation:  J Perinat Med     Publication Date:  1989  
Date Detail:
Created Date:  1990-04-09     Completed Date:  1990-04-09     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0361031     Medline TA:  J Perinat Med     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  297-303     Citation Subset:  IM    
Department of Obstetrics and Gynecology, Guillermo Grant Benavente Hospital, Concepción, Chile.
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MeSH Terms
Pregnancy Trimester, Second
Prenatal Diagnosis*
Thorax / abnormalities
Twins, Conjoined*

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