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Prenatal detection of two different monosomic cell lines by chorionic villus sampling.
[monosomy 21]
We
present
a
prenatal
case
of
mosaicism
with
at
least
two
monosomy
cell
lines
:
one
with
monosomy
21
(
45
,
XY
,
-
21
)
and
one
missing
the
Y
(
45
,
X
)
and
a
possible
third
46
,
XY
in
chorionic
villus
cell
culture
.
Cytogenetic
studies
were
initiated
following
the
ultrasound
detection
at
11
weeks
of
a
large
cystic
hygroma
and
in
utero
growth
retardation
.
Spontaneous
fetal
demise
occurred
at
12
weeks
and
the
pregnancy
was
terminated
.
To
our
knowledge
,
this
is
the
first
report
of
two
different
monosomic
cell
lines
found
in
chorionic
villus
cells
.