We report on a case of double aneuploidy involving Down and Turner cell lines in a female child with a massive capillary hemangioma of the left orbit and mild clinical features of Down syndrome. Cytogenetic findings with G-banding revealed mosaicism in her peripheral blood, i.e. mos45,X[48]/47,XX,+21[28]/46,XX[12/47,XXX[12]. Mosaicism of such nature is rare and to our knowledge the present case is the first reported of Turner-Down double aneuploidy mosaicism associated with an orbital capillary hemangioma. An annotated bibliography of earlier reported cases with documented karyotyping is also included.
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