Foetus-in-foetu.
D000005:Abdomen; D001158:Arteries / Q000002:abnormalities; D004417:Dyspnea; D005260:Female; D005333:Fetus / Q000033:anatomy & histology; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D012187:Retroperitoneal Space; D012769:Shock; D014427:Twins / Q000145:classification; D014428:Twins, Conjoined / Q000601:surgery; D014680:Veins / Q000002:abnormalities