RATIONALE: Sirenomelia is a rare congenital malformation that threatens fetal survivals. The cases in which twin with sirenomelia and chromosomal abnormality have been seldomly reported. We reported a dichorionic twin case in which one twin had sirenomelia, the other twin had a normal phenotype, and they had different chromosomal abnormalities. PATIENT CONCERNS: The abnormal twin was found at 22 weeks by ultrasound. The sirenomelia fetus was complicated with a thoracic stenosis, enlarged rectum without anal opening, the absence of bilateral kidneys, a single umbilical artery, a single lower limb, the abnormal curvature of spine, double outlet of right ventricle, which were the indicatives of the chromosome detection. DIAGNOSIS: The copy number variation of the sirenomelia fetus was detected as a deletion of 4.8Mb in 11p11.12-11q11. The co-twin was found with del(Y)(q11.223q11.23), which was as the same as his father's. The mother had normal chromosome. The parents had normal phenotypes. It was firstly reported a microdeletion with sirenomelia fetus. INTERVENTIONS: There was no specific treatments for the twins. OUTCOMES: Intrauterine death of the sirenomelia fetus was found at 27 weeks and postnatal death after inevitable abortion happened to the co-twin. LESSONS: Prenatal ultrasound was responsible for recognizing sirenomelia, and the detailed ultrasound scanning and chromosome detection should be done for the co-twin. The etiology of sirenomelia remains unclear, and genetic detection is also necessary for its pathogenesis research.
RATIONALE: Sirenomelia is a rare congenital malformation that threatens fetal survivals. The cases in which twin with sirenomelia and chromosomal abnormality have been seldomly reported. We reported a dichorionic twin case in which one twin had sirenomelia, the other twin had a normal phenotype, and they had different chromosomal abnormalities. PATIENT CONCERNS: The abnormal twin was found at 22 weeks by ultrasound. The sirenomelia fetus was complicated with a thoracic stenosis, enlarged rectum without anal opening, the absence of bilateral kidneys, a single umbilical artery, a single lower limb, the abnormal curvature of spine, double outlet of right ventricle, which were the indicatives of the chromosome detection. DIAGNOSIS: The copy number variation of the sirenomelia fetus was detected as a deletion of 4.8Mb in 11p11.12-11q11. The co-twin was found with del(Y)(q11.223q11.23), which was as the same as his father's. The mother had normal chromosome. The parents had normal phenotypes. It was firstly reported a microdeletion with sirenomelia fetus. INTERVENTIONS: There was no specific treatments for the twins. OUTCOMES: Intrauterine death of the sirenomelia fetus was found at 27 weeks and postnatal death after inevitable abortion happened to the co-twin. LESSONS: Prenatal ultrasound was responsible for recognizing sirenomelia, and the detailed ultrasound scanning and chromosome detection should be done for the co-twin. The etiology of sirenomelia remains unclear, and genetic detection is also necessary for its pathogenesis research.
Authors: Iêda M Orioli; Emmanuelle Amar; Jazmin Arteaga-Vazquez; Marian K Bakker; Sebastiano Bianca; Lorenzo D Botto; Maurizio Clementi; Adolfo Correa; Melinda Csaky-Szunyogh; Emanuele Leoncini; Zhu Li; Jorge S López-Camelo; R Brian Lowry; Lisa Marengo; María-Luisa Martínez-Frías; Pierpaolo Mastroiacovo; Margery Morgan; Anna Pierini; Annukka Ritvanen; Gioacchino Scarano; Elena Szabova; Eduardo E Castilla Journal: Am J Med Genet C Semin Med Genet Date: 2011-10-14 Impact factor: 3.908
Authors: Michael G Pinette; Matthew Hand; Rebecca C Hunt; Jacquelyn Blackstone; Joseph R Wax; Angelina Cartin Journal: J Ultrasound Med Date: 2005-11 Impact factor: 2.153
Authors: B Källén; E E Castilla; P A Lancaster; O Mutchinick; L B Knudsen; M L Martínez-Frías; P Mastroiacovo; E Robert Journal: J Med Genet Date: 1992-01 Impact factor: 6.318