title: Characteristic pattern of Doppler umbilical arterial velocity waveform in conjoint twins.
abstract: Doppler blood flow studies in a pair of conjoint twins at 18 weeks gestation revealed a characteristic 'double layer' spectral velocity waveform from the umbilical arteries. This is the result of signals originating from 2 separate arterial supplies adjacent to each other in a single umbilical cord. Such a characteristic feature provides an additional sonographic sign in the diagnosis of conjoint twins.
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014428:Twins, Conjoined / Q000503:physiopathology*; D014463:Ultrasonography; D014469:Umbilical Arteries / Q000503:physiopathology*