Xiphopagus

Of particular interest in the Section on Obstetrics is the detailed article touching on the xiphopagus twins Radica and Doodica.

Source: wiktionary

This type of anomaly, along with the xiphopagus type, is especially compatible with survival.

Source: wiktionary

Second, a discordant presentation does not preclude the diagnosis of conjoined twins, particularly in xiphopagus twins.

Source: wiktionary

Xiphopagi are those in which the ensiform processes are united by a cartilaginous bridge. The peritoneum passes for some distance into the connecting structure (the well-known Siamese twins were xiphopagi).

Source: wiktionary