title: Absence of the d triradius.
abstract: Ten cases of absence of the d triradius are reported from a heterogeneous collection of dermatoglyphs from 3610 subjects. There was one case in 1000 normal' controls. There were three cases in a group of 800 subjects with congenital heart disease. There were two cases with the 49, XXXXY constitution, a previously noted association. A pair of probably monozygous twins were discordant for absence of the d triradius. The condition was left-sided in six cases, right-sided in one case, and affected both sides in three cases.
mesh_terms: D000328:Adult; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000235:genetics; D025063:Chromosome Disorders; D003878:Dermatoglyphics; D004739:England; D005260:Female; D006225:Hand; D006330:Heart Defects, Congenital / Q000235:genetics; D006801:Humans; D008297:Male; D011247:Pregnancy; D012868:Skin Abnormalities; D014430:Twins, Monozygotic