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[Skeletal muscle MRI in a patient with neuralgic amyotrophy].
[neuralgic amyotrophy]
Neuralgic
amyotrophy
has
been
attributed
to
lesions
in
the
brachial
plexus
.
However
,
recent
studies
suggest
mononeuropathy
multiplex
as
an
underlying
pathology
at
least
in
a
group
of
patients
with
neuralgic
amyotrophy
.
We
report
a
man
who
developed
weakness
of
finger
extensors
following
severe
shoulder
pain
.
Neurological
examination
revealed
weakness
in
the
muscles
innervated
by
the
left
posterior
interosseus
nerve
and
the
ulnar
nerve
.
We
diagnosed
him
with
neuralgic
amyotrophy
based
on
the
typical
clinical
course
and
the
neurological
and
neurophysiological
findings
.
A
skeletal
muscle
MRI
revealed
abnormal
high
T
2
and
STIR
signals
in
the
left
triceps
brachialis
muscle
,
which
is
innervated
by
a
proximal
branch
of
the
radial
nerve
,
and
in
the
muscles
innervated
by
the
posterior
interosseous
and
ulnar
nerves
.
The
distribution
of
the
denervated
muscles
suggested
that
our
patient
had
combined
lesions
of
the
peripheral
nerve
branches
rather
than
the
brachial
plexopathy
.
Our
report
highlights
the
potential
of
MRI
for
detecting
denervated
muscles
in
neuralgic
amyotrophy
.