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Retroperitoneal liposarcoma: MR characteristics and pathological correlative analysis.
[pleomorphic liposarcoma]
Liposarcoma
is
the
most
common
primary
retroperitoneal
malignant
neoplasm
.
However
,
preoperative
diagnosis
is
a
common
problem
due
to
lack
of
characteristic
clinical
presentations
.
It
has
been
assumed
that
MRI
,
based
on
its
high
soft
-tissue
resolution
,
could
discover
and
discern
different
subtypes
of
this
tumor
.
Moreover
,
there
has
been
little
in
the
literature
to
compare
the
MRI
features
with
pathological
appearances
of
the
retroperitoneal
liposarcomas
.
We
retrospectively
analyzed
19
cases
of
retroperitoneal
liposarcoma
(
11
males
and
8
females
,
aged
41
-
79
years
)
proved
surgically
and
histologically
.
All
patients
underwent
MRI
examination
before
and
after
the
administration
of
contrast
agent
.
The
MRI
features
and
postoperative
pathological
appearances
were
studied
correlatively
.
Nine
cases
were
located
in
the
anterior
pararenal
space
,
four
cases
in
the
posterior
pararenal
space
and
six
cases
in
the
perirenal
space
.
Among
all
cases
,
ten
cases
were
present
in
the
right
retroperitoneum
and
nine
cases
in
the
left
.
The
average
diameter
of
the
tumors
was
14
.
7
cm
(
range
from
7
.
5
cm
to
26
cm
)
.
The
MR
signal
intensity
of
liposarcoma
was
heterogeneous
and
varied
greatly
,
depending
on
the
components
of
the
tumor
and
the
different
histological
patterns
.
There
are
five
subtypes
of
retroperitoneal
liposarcoma
.
Myxoid
liposarcoma
(
n
=
7
)
exhibited
low
signal
intensity
on
T
1
W
image
and
high
signal
intensity
on
T
2
W
image
.
On
histologic
analysis
,
myxoid
liposarcoma
consists
of
a
myxoid
matrix
as
the
predominant
component
and
small
amounts
of
mature
fat
.
Enhanced
solid
tissues
and
thickened
septa
of
myxoid
liposarcoma
were
seen
on
post-contrast
image
.
Well-differentiated
liposarcoma
(
n
=
5
)
presented
in
high
signal
intensity
on
T
1
W
images
,
intermediate
signal
intensity
on
T
2
W
images
,
drop-out
signal
intensity
on
fat-suppressed
MR
images
;
The
enhanced
tenuous
septa
and
solid
tissues
were
seen
on
post-contrast
image
.
Round
-cell
liposarcoma
(
n
=
2
)
and
pleomorphic
liposarcoma
(
n
=
2
)
exhibited
soft
-tissue
tumor
signal
intensity
without
characteristic
fat
signal
.
One
case
of
round
-cell
liposarcoma
appeared
with
intratumoral
hemorrhage
and
invaded
the
inferior
vena
cava
.
Dedifferentiated
liposarcoma
(
n
=
3
)
exhibited
small
amounts
of
fatty
components
with
a
clear
demarcation
between
fat
and
nonadipose
solid
tissue
on
MR
images
.
One
case
of
dedifferentiated
liposarcoma
invaded
the
kidney
.
MRI
can
clearly
demonstrate
shape
,
margin
,
internal
components
and
surrounding
tissues
.
Different
subtypes
of
retroperitoneal
liposarcoma
exhibited
varying
MRI
features
,
depending
on
tumor
histological
components
.
MRI
should
be
an
ideal
method
for
diagnosing
retroperitoneal
liposarcoma
.
Diseases
Validation
Diseases presenting
"could discover and discern different subtypes of this tumor"
symptom
pleomorphic liposarcoma
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