Abstract | INTRODUCTION: Trisomy 9 is an uncommon chromosome abnormality that may be seen in a mosaic or non-mosaic state. OBJECTIVE: To better define the phenotype and prognosis of this disorder we report a new case of mosaic trisomy 9 with a long-term survival. CLINICAL REPORT: We present the case of a female patient, born from the first pregnancy of a healthy couple. Fetal ultrasounds disclosed intrauterine growth retardation and oligohydramnios. Cesarean section was performed in the 34th week. Birth weight was 1,478 g. Neonatal examination showed: dolichocephaly; hypotelorism, microphthalmia, short palpebral fissures; broad-based nose with bulbous tip; micrognathia; low-set malformed ears; abnormal hands and feet; no other malformations. The initial karyotype determination was normal (46,XX). At 17 months of age, a second karyotype was requested because the patient developed severe psychomotor retardation. Chromosome analysis showed mosaic trisomy 9 (46,XX/47,XX, + 9). Six months later, a single upper central incisor was noted. To our knowledge, this feature has not been reported previously in the trisomy 9. The patient is now 4 years old. She shows severe psychomotor retardation, but no other complications. COMMENTS: It is important to be aware of the possibility that mosaicism may exist in a patient with normal blood karyotype and abnormal phenotype. We conclude that a great number of cells is needed in order to obtain a correct karyotype diagnosis. Correct diagnosis is essential to define the prognosis and provide accurate genetic counselling.
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Authors | J Sánchez Zahonero, M Andrés Celma, M J López García |
Journal | Anales de pediatria (Barcelona, Spain : 2003)
(An Pediatr (Barc))
Vol. 68
Issue 3
Pg. 273-6
(Mar 2008)
ISSN: 1695-4033 [Print] Spain |
Vernacular Title | Mosaicismo de trisomía 9: caso de larga supervivencia. |
PMID | 18358140
(Publication Type: Case Reports, English Abstract, Journal Article)
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Topics |
- Chromosomes, Human, Pair 9
(genetics)
- Female
- Humans
- Infant, Newborn
- Karyotyping
- Mosaicism
- Phenotype
- Psychomotor Disorders
(genetics)
- Survival
- Trisomy
(genetics)
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