Prenatal diagnosis of mosaic ring 22 duplication/deletion with terminal 22q13 deletion due to abnormal first trimester screening and choroid plexus cyst detected on ultrasound.
We report a rare case of mosaic ring chromosome 22 duplication/deletion in a fetus for whom karyotype analysis was required because of an abnormal finding in the maternal serum screening test and a choroid plexus cyst detected on prenatal ultrasound. Additional prenatal study of the amniotic fluid by fluorescence in situ hybridization was performed and the terminal 22q13.3 deletion was detected on ring chromosome. The final karyotype was 45,XX,-22[3]/46,XX,r(22)(p11q13.2)[63]/46,XX,idicr(22)(p11q13.2;p11q13.2)[2]dn.ishder(22)(N25+, ARSA-, ter-). The pegnancy was terminated. Cytogenetic analysis of the intracardiac blood also revealed ring 22 mosaicism with only one metaphase spread with idicr(22) as the unstable isodicentric rings are subsequently lost from most cells. We discuss the prenatal diagnosis of this rare condition.
Department of Medical Genetics, Gazi University Faculty of Medicine, Ankara, Turkey.
Altuğ
A
Koç
Ozgür
O
Arisoy
Elif
E
Pala
Mehmet
M
Erdem
Ayşegül Oztürk
AO
Kaymak
Ozgür
O
Erkal
Meral Yirmibeş
MY
Karaoğuz
D000028:Abortion, Induced; D020863:Central Nervous System Cysts / Q000000981:diagnostic imaging* / Q000235:genetics; D002831:Choroid Plexus / Q000000981:diagnostic imaging*; D016545:Choroid Plexus Neoplasms / Q000000981:diagnostic imaging* / Q000235:genetics; D002872:Chromosome Deletion; D002892:Chromosomes, Human, Pair 22; D005260:Female; D005820:Genetic Testing; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D009030:Mosaicism; D011247:Pregnancy; D011261:Pregnancy Trimester, First / Q000235:genetics; D011296:Prenatal Diagnosis; D012303:Ring Chromosomes; D016216:Ultrasonography, Prenatal