monosomy 21 https://www.malacards.org/card/monosomy_21 21q- syndrome GARD:0010860 monosomy 21q Monosomy 21 is a chromosomal anomaly characterized by the loss of variable portions of a segment of the long arm of chromosome 21 that leads to an increased risk of birth defects, developmental delay and intellectual deficit. NCIT:C36469 MESH:C537108 partial monosomy 21q deletion 21q MONDO:0018930 21q deletion syndrome partial 21q monosomy monosomy type 21 Orphanet:574 21q monosomy chromosome 21q deletion UMLS:C0795875 21q deletion MEDGEN:162883 obsolete chromosomal anomaly with cataract chromosome 21 disorder