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Thoracic outlet syndrome in a patient with absent scalenus anterior muscle.
[thoracic outlet syndrome]
This
case
report
describes
the
rare
anomaly
of
an
absent
right
anterior
scalene
muscle
presenting
with
the
symptoms
and
signs
of
the
thoracic
outlet
syndrome
.
The
thoracic
outlet
syndrome
in
our
patient
can
be
attributed
to
the
absence
of
the
right
anterior
scalene
muscle
,
which
resulted
in
the
brachial
plexus
being
in
proximity
to
the
subclavian
vein
and
artery
in
a
narrowed
and
abnormal
interscalene
space
.
In
addition
,
the
absence
of
the
anterior
scalene
muscle
resulted
in
the
neurovascular
structures
being
compressed
onto
the
first
rib
in
the
costoclavicular
space
.
The
most
likely
cause
of
the
presentation
is
,
however
,
the
possibility
of
the
presence
of
aberrant
muscle
slips
,
which
would
cause
compression
of
the
structures
in
the
anterior
(
venous
)
and
posterior
(
neurological
)
sections
of
the
thoracic
outlet
.