partial twinning

partial twinning

 A group of rare congenital anomalies of cloacally-derived structures–eg, focal doubling of the GI tract at Meckel's diverticulum, extending to anus, doubling of bladder, vagina, penis, sacrum, or lumbar vertebrae
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'Split notochord theory' proposes neural tube traction mechanism behind enteric duplication associated with vertebral anomalies.'Partial twinning' can be responsible for some duplications of the foregut and hindgut associated with duplication of other paired structures such as genitals and urinary tract.
Several theories have been proposed to explain the causation of duplication cysts, including aberrant recanalisation of the gut lumen, persistent embryonic diverticulum, hypoxic or vascular occlusive events, partial twinning, and the 'split notochord' theory.