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Skull parosteal lipoma with reactive hyperostosis: a case report.
[well-differentiated liposarcoma]
A
50
-
year
-old
female
presented
with
more
than
20
-
year
history
of
a
large
subcutaneous
mass
in
the
left
parieto-
occipital
portion
.
Magnetic
resonance
(
MR
)
imaging
revealed
the
lipomatous
mass
to
show
a
high
signal
intensity
in
both
T
1
-
and
T
2
-
weighted
images
.
A
part
of
the
lipomatous
lesion
progressed
into
the
underlying
hyperostosis
and
skull
.
The
preoperative
diagnosis
was
skull
invasion
of
a
well-differentiated
liposarcoma
.
The
tumor
was
removed
completely
,
including
the
underlying
hyperostosis
and
skull
.
Microscopy
confirmed
a
lipoma
without
any
lipoblasts
,
which
was
firmly
attached
to
the
reactive
hyperostosis
,
and
islands
of
lipoma
were
involved
in
the
underlying
hyperostosis
and
skull
cortex
.
A
pathological
diagnosis
of
parosteal
lipoma
with
reactive
hyperostosis
was
made
.
Long
-term
progression
of
parosteal
lipoma
may
cause
to
involve
the
underlying
hyperostosis
and
skull
,
and
led
to
the
diagnosis
of
invasion
of
a
malignant
tumor
on
MR
imaging
.
