The Use of Fluorescence <i>In situ</i> Hybridisation in the Diagnosis of Hidden Mosaicism in Egyptian Patients with Turner Syndrome.

Studying different tissues in TS is important for the detection of cryptic mosaics as mosaicism may not be detected in peripheral blood, but may be significant in tissue samples of different embryonic origin.[ 6 , 21 , 59 ] In the current study, Y chromosome was the origin of the marker detected in the three patients with 46,X, +mar cell line, and it was identified by blood lymphocyte and buccal FISH, in agreement with other reports,[ 53 , 60 ] who identified the origin of the marker present among their studied patients to be Y chromosome using FISH.

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