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A case of mosaic ring chromosome 13 syndrome

Korean Journal of Pediatrics 2009;52(2):242-246.
Published online February 15, 2009.
A case of mosaic ring chromosome 13 syndrome
Soo Young Kim, Soo Min O, Mi Jeong Kim, Eun Song Song, Young Ok Kim, Young Youn Choi, Young Jong Woo, Tai Ju Hwang
Department of Pediatrics, Chonnam National University Medical School, Gwangju, Korea
13번 환염색체의 모자이크 증후군
김수영, 오수민, 김미정, 송은송, 김영옥, 최영륜, 우영종, 황태주
전남대학교 의과대학 소아과학교실
Young Youn Choi, Email: yychoi@chonnam.ac.kr
The clinical features of ring chromosome 13 include mental and growth retardation, CNS anomalies, facial dysmorphism, cardiac defects, genital malformations, limb anomalies, skeletal deformities and anal malformations. Although many cases of ring chromosome 13 have been reported worldwide, only 6 cases have been reported in Korea, and the latter cases were not mosaic but pure ring chromosome 13. Here we report a case with mosaic ring chromosome 13. The baby boy was born at 37 weeks of gestation by induced vaginal delivery due to intrauterine growth restriction (IUGR). He was the second baby of a 28-year-old hepatitis B carrier mother and a 32-year-old father. There was no family history of chromosomal anomalies. The baby was a symmetric IUGR with a birth weight of 1,860 g, length of 44.8 cm, and head circumference of 29.4 cm. The physical examination revealed microcephaly, trigonocephaly, flat occiput, large ears, short neck and dysmorphic facial features, including microophthalmia, hypertelorism, antimongoloid slanting palpebral fissures, a flat nasal bridge, and micrognathia. The karyotype of this patient performed by peripheral blood lymphocytes was 46,XY,r(13)(p13q34)/45,XY,-13/46,XY,dic r(13;13)(p13q34;p13q34). The baby showed failure to thrive, hypotonia, and developmental delay. We report the first case of mosaic ring chromosome 13 in a male baby in Korea and compare this case with other Korean cases of non-mosaic ring chromosome 13.
Key Words: Mosaicism, Ring chromosome 13, Facial dysmorphism, Intrauterine growth restriction (IUGR)

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