“…Since placental examination revealed monochorionic diamniotic status in the context of sex discordant babies, further evaluation of the genotype of the babies was undertaken via evaluation of blood lymphocytes for karyotype, fluorescence in situ hybridization (FISH), and microarray studies. Twin A, girl showed a 45,X[2]/46,X,idic(Y)(q11.223pter) [18] karyotype and Twin B, male demonstrated a 45,X[4]/46,X, idic(Y)(q11.223) [16] karyotype (Figure 3(A) and (C)).…”