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Prostatic adenocarcinoma metastatic to pleomorphic liposarcoma, a "collision phenomenon": report of a case with review of pelvic collision tumors.
[pleomorphic liposarcoma]
"
Collision
tumor
"
is
an
uncommon
phenomenon
characterized
by
coexistence
of
two
completely
distinct
and
independent
tumors
at
the
same
site
.
Collision
tumors
have
been
reported
in
different
sites
in
the
body
;
however
,
these
are
particularly
uncommon
in
the
pelvic
cavity
.
A
70
-
year
-old
man
,
with
prior
history
of
urothelial
and
prostate
cancer
,
presented
with
a
large
pelvic
mass
detected
on
imaging
studies
.
Pathological
examination
revealed
a
large
liposarcoma
with
prostatic
carcinoma
embedded
in
it
.
Immunohistochemistry
and
florescence
in
situ
hybridization
studies
were
performed
to
reach
to
a
conclusive
diagnosis
.
To
the
best
of
our
knowledge
,
this
is
the
second
case
reported
till
date
.
We
present
the
challenges
encountered
in
the
diagnosis
of
this
case
and
review
of
pelvic
collision
tumors
.