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Thoracic outlet syndrome caused by schwannoma of brachial plexus.
[thoracic outlet syndrome]
Schwannomas
are
benign
,
usually
slow
-growing
tumors
that
originate
from
Schwann
cells
surrounding
peripheral
,
cranial
,
or
autonomic
nerves
.
The
most
common
form
of
these
tumors
is
acoustic
neuroma
.
Schwannomas
of
the
brachial
plexus
are
quite
rare
,
and
symptomatic
schwannomas
of
the
brachial
plexus
are
even
rarer
.
A
47
-
year
-old
woman
presented
with
a
1
-
year
history
of
dysesthesia
,
neuropathic
pain
,
and
mild
weakness
of
the
right
upper
limb
.
Results
of
physical
examination
and
electrodiagnostic
studies
supported
a
diagnosis
as
thoracic
outlet
syndrome
.
Conservative
treatment
did
not
relieve
her
symptoms
.
After
9
months
,
a
soft
mass
was
found
at
the
upper
margin
of
the
right
clavicle
.
Magnetic
resonance
imaging
showed
a
3
.
0
×
1
.
8
×
1
.
7
cm
ovoid
mass
between
the
inferior
trunk
and
the
anterior
division
of
the
brachial
plexus
.
Surgical
mass
excision
and
biopsy
were
performed
.
Pathological
findings
revealed
the
presence
of
schwannoma
.
After
schwannoma
removal
,
the
right
hand
weakness
did
not
progress
any
further
and
neuropathic
pain
gradually
reduced
.
However
,
dysesthesia
at
the
right
C
8
and
T
1
dermatome
did
not
improve
.
Diseases
Validation
Diseases presenting
"right hand weakness"
symptom
thoracic outlet syndrome
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