Smigiel Robert, Pilch Jacek, Makowska Izabela, Busza Halina, Slezak Ryszard, Sasiadek Maria M
Department of Genetics, Wroclaw Medical University, Marcinkowskiego 1, Wroclaw, 50-368, Poland.
Eur J Pediatr. 2008 Sep;167(9):1063-5. doi: 10.1007/s00431-007-0608-7. Epub 2007 Nov 14.
The Pallister-Killian syndrome is a clinically recognizable syndrome, usually due to a tissue-specific mosaicism for a 12p isochromosome [i(12p)]. We report a rare case of Pallister-Killian syndrome with 12p mosaicism, tetrasomy/trisomy/disomy in fibroblasts and trisomy/disomy in lymphocytes. Marker chromosomes were investigated with conventional cytogenetic techniques and fluorescent in situ hybridisation (FISH). The karyotype was established as: mos47,XX,+12p/47,XX,+i(12p)/46,XX. The cytogenetic result of the extra mosaic 12p presented in lymphocytes suggested the diagnosis of trisomy 12p, although, in combination with clinical manifestations, the Pallister-Killian syndrome was considered and confirmed by the cytogenetic analysis of fibroblasts.