mosaic trisomy 6 Trisomy 6 is a rare prenatal finding. Trisomy 6 conceptions have not been observed in the large case reports of chromosomal mosaicism detected during chorionic villus sampling (Hahnemann & Vejerslev 1997). SCTID:205647005 UMLS:C0432414 GARD:0007815 trisomy 6 mosaicism MONDO:0043277 NCIT:C36475 MEDGEN:96603 chromosome 6 disorder trisomy