Table 1 |
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|
Classification of conjoined twins based on the theoretical site of union [9]. |
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|
Embryonic aspect |
Type |
Incidence |
Extent of union |
|
|
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|
Ventral (87 %) |
|||
|
Rostral (48 %) |
Cephalopagus |
11 % |
Top of head to umbilicus |
|
Thoracopagus |
19 % |
Thorax, upper abdomen, conjoined heart |
|
|
Omphalopagus |
18 % |
Thorax, upper abdomen, separate hearts |
|
|
Caudal (11 %) |
Ischiopagus |
11 % |
Lower abdomen, genitourinary tract |
|
Lateral (28 %) |
Parapagus |
28 % |
Pelvis, variable trunk |
|
Dicephalus 2 heads |
|||
|
Diprosopus 2 faces |
|||
|
Dorsal (13 %) |
Craniopagus |
5 % |
Cranial vault |
|
Pygopagus |
6 % |
Sacrum |
|
|
Rachipagus |
2 % |
Vertebral column (midportion) |
|
|
|
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|
Gul et al. BMC Pregnancy and Childbirth 2004 4:13 doi:10.1186/1471-2393-4-13 |
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