title: Partial trisomy of chromosome 18 (pter leads to q11): a discussion on the identification of the critical segment.
abstract: Partial trisomy for the short arm and the proximal region of the long arm of chromosome 18 was observed in a male child of 4 years of age. The trisomy appeared de novo as a free, practically metacentric chromosome. A review of other cases of partial trisomy 18 suggests that there is a critical segment of the chromosome responsible for typical phenotype of the trisomy 18. In this report we add the description of a new case to the work already carried out in the delimitation of this critical segment.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000235:genetics*; D002871:Chromosome Banding; D025063:Chromosome Disorders; D002902:Chromosomes, Human, 16-18; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics; D008297:Male; D010641:Phenotype; D014314:Trisomy