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OBJECTIVE We present prenatal diagnosis of mosaicism for trisomy 11 in a single colony at amniocentesis with a favorable outcome. CASE REPORT A 34-year-old woman underwent amniocentesis at 16 weeks of gestation because of advanced maternal age. Amniocentesis revealed a result of 47,XY,+11[1]/46,XY[9]. In 10 colonies of cultured amniocytes, all five cells in one colony had a karyotype of trisomy 11, while the rest nine colonies had a normal karyotype. The parental karyotypes were normal. Repeat amniocentesis was performed at 19 weeks of ge