Her case is mentioned in Nicolas-François and Geneviève Regnaults Les écarts de la nature, published that year. Her full lifespan is unknown, but is mentioned to still be alive in French publications as late as 1777. Lali Singh
Lali Singh (10 March – 10 May 2008) was born to Sushma and Vinod Singh in Saini, Sunpura Sohanpur village, near Delhi; the birth was delayed by dystocia caused by her large head, and her birth in a hospital was facilitated by her mothers receiving an episiotomy. She was one of the very few infants with diprosopus to survive well past birth, and may have been the only known living individual with complete facial duplication. Her facial features included two pairs of eyes, two noses, and two mouths (but only one pair of ears). She was seen as the reincarnation of the goddess Durga, who is sometimes depicted with many limbs and eyes. Sushma and Vinod Singh declined an offer from local doctors to evaluate their daughter through CT or MRI scanning. Without diagnostic imaging, it was not possible to know the full extent to which the childs condition might have affected her brain and other vital structures in her head and neck. Thus, any estimation of her ability to thrive or even survive could be only speculative, though Lalis family described her as functioning normally. It is also unknown whether neurosurgeons or craniofacial surgeons, if consulted, would have had feasible solutions to offer with respect to corrective surgery.
Diprosopus (Greek: διπρόσωπος, "two-faced", from δι-, di-, "two" and πρόσωπον, prósopon [neuter], "face", "person"; with Latin ending), also known as craniofacial duplication (cranio- from Greek κρανίον, "skull", the other parts Latin), is an extremely rare congenital disorder whereby parts (accessories) or all of the face are duplicated on the head. Development
Although classically considered conjoined twinning (which it resembles), diprosopus is not normally due to the fusion or incomplete separation of two embryos. It is the result of abnormal activity by the protein SHH (sonic hedgehog). (The name of this protein was inspired by the Sonic the Hedgehog video game character and is part of an idiosyncratic naming tradition in molecular biology research. )SHH and its corresponding genes have been found to play an important role in signaling craniofacial patterning during embryonic development. Among other things, SHH governs the width of facial features. In excess it leads to widening of facial features and to duplication of facial structures. The greater the widening, the more structures are duplicated, often in a mirror image form. This has been demonstrated in the laboratory by introducing pellets of the SHH protein into chicken embryos, resulting in chickens with duplicate beaks. Inadequate amounts of that protein lead to opposite conditions such as cyclopia where facial features are insufficiently developed.Healthy brain development is also dependent on the signaling function of SHH. During embryonic development, SHH directs embryonic cells to organize in specific areas that later become specialized neural tissues, thus controlling the size and shape of brain structures.