Abstract
Pallister — Killian syndrome (PKS) is a sporadic chromosomal anomaly caused by a tissue-specific mosaic distribution of an additional isochromosome 12p. A case of second trimester fetus with PKS is presented. Antenatal ultrasound examination showed left diaphragmatic hernia. Standard cytogenetic analysis of cultured amniocytes supposed mosaic tetrasomy 12p: 46,XY/ 47,XY,+?i(12p). Fluorescent in situ hybridization (FISH) was used to confirm the nature of the additional chromosome. Pathological examination confirmed prenatal diagnosis.
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