PSEUDOTRISOMY 18 By N., Sam M.S. - 20 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 Dissociative Identity Disorder MENTAL RETARDATION (CAUSES) Ethics and Legal Course: Landmark Legal Case CLINICAL PSYCHOLOGY Discrimination and Mental Illness in the LGBT Population MENTAL RETARDATION (PREVENTION, CARE, AND TREATMENT) CHILD PSYCHIATRY EXPRESSIVE BEHAVIOR Diagnosis and Treatment Planning LEGAL PSYCHIATRY (Forensic Psychiatry) Cite this page: N., Sam M.S., "PSEUDOTRISOMY 18," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/pseudotrisomy-18/ (accessed August 16, 2022).