PSEUDOTRISOMY 18 By N., Pam M.S. - April 28, 2013 A congenital disorder with symptoms mirroring trisomy 18 with no substantiation of chromosome-18 trisomy. All affected subjects have evidence of mental retardation. PSEUDOTRISOMY 18: "The doctor knew she was dealing with a case of pseudotrisomy 18." Related Psychology Terms GROUP G MONOSOMY PRADER-WILLI SYNDROME (PWS| CEBOCEPHALY CAT'S-EYE SYNDROME ARGININOSUCCINIC ACIDURIA KLINEFELTER'S SYNDROME SILVER-RUSSELL SYNDROME ARTHROGRYPOSIS MULTIPLEX CONGENITA AUTOSOME DOWN SYNDROME Cite this page: N., Pam M.S., "PSEUDOTRISOMY 18," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/pseudotrisomy-18/ (accessed October 12, 2019).