Frequency
Ischiopagus is a rare anomaly occurring in about 1 and every 100,000 live births and occurring in 1 out of 10 conjoined twin births. Most Ischiopagus cases are common in the areas of India and Africa. Of the varieties of Ischiopagus twins, Ischiopagus Tetrapus is more prevalent, happening in 68.75% of all Ischiopagus cases. Ischiopagus Tripus occurs in 31.25% of cases while Ischiopagus Dipus occurs in only 6.25% of all Ischiopagus cases.
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