Phenotypic spectrum of mosaic trisomy 18: two new patients, a literature review, and counseling issues.

Abstract excerpt

Mosaic trisomy 18 occurs when two different cell lines exist in the same individual; one cell line has two copies of chromosome 18, while the other has three copies. Here we present two new patients with mosaic trisomy 18, summarize 31 reported cases from the literature, and discuss management and counseling themes. Our first patient is an 8(1/2)-year-old female with normal intelligence and no significant...

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