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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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.