TIL Conjoined triplets are among the rarest of human malformations, as are asymmetric or parasitic conjoined twins. In addition to some historical descriptions, only three attested clinical cases of symmetric conjoined triplets have been published to date.

https://www.researchgate.net/figure/Conjoined-triplets-one-set-of-thoracopagus-twins-with-a-parapagus-twin-attached-t…
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