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Table 1 Frequency of the main clinical characteristics of inv dup(15) or idic(15) syndrome

From: The inv dup (15) or idic (15) syndrome (Tetrasomy 15q)

Exceeding 75% From 25% to 50% Below 25%
Hypotonia, lax ligaments Brain abnormalities Congenital heart defects
Developmental delay/Intellectual disability Genitourinary tract defects Microcephaly
Autistic behavior Growth retardation  
Epilepsy   
Minor dysmorphic features (mainly involving the face)