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13 June 2012

Diagnosis of chromosomal abnormalities in a patient with thanatophoric dysplasia (TD) type I: The first report describing an important association between cytogenetic findings and TD

Mehmet Turgut, Osman Demirhan, Erdal Tunç, Ibrahim Hakan Bucak, Perihan Yasemen Canoz, Fatih Temiz, Gokhan Tumgor

DOI: 10.12659/AJCR.883026

Am J Case Rep 2012; 13:109-113

Abstract

Background: Thanatophoric dysplasia (TD) is the most lethal and most severe type of dysplasia. It has distinct features, the most important of which is short tubular bones and short ribs with platyspondyly, allowing a precise radiologic and prenatal ultrasonographic diagnosis. It has been reported to be caused by mutations in the FGFR3 gene, but exactly how cytogenetic abnormalities might lead to TD is unclear.
Case Report: We report a case of TD with different prenatal sonographic features compatible with the classification of type I. In the result of cytogenetic examination, we found de novo CAs in 28% of cells analyzed from the affected infant; 75% of the abnormalities were numerical, and of those, 25% were structural aberrations; 21% of cells revealed predominantly numerical aberrations. Monosomy 18, 21 and 22 was observed in 4% of cells, monosomy 20 in 2%, and monosomy 7, 8, 14, 17 and 19 in 1%. Structural changes were observed in 7% of cells.
Conclusions: It appears that these chromosomes may be preferentially involved in and important for TD development.

Keywords: Thanatophoric Dysplasia, type I, chromosomal aberrations, Monosomy

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923