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[A boy with cervical focal myositis].
[focal myositis]
Focal
myositis
is
a
rare
idiopathic
pseudotumour
that
mostly
occurs
in
the
extremities
in
adults
.
An
8
-
year
-old
boy
presented
with
a
few
months
history
of
swelling
in
the
neck
and
fever
.
Ultrasound
investigation
revealed
an
inhomogenous
mass
consistent
with
lymphadenitis
.
After
nine
days
of
antibiotic
therapy
,
the
clinical
picture
of
fever
and
swelling
was
unchanged
.
MRI
imaging
revealed
continuity
of
the
swelling
in
the
sternocleidomastoid
muscle
and
a
malignant
process
was
suspected
.
Microscopy
showed
no
malignant
cells
,
however
,
but
a
lymphoplasmocytic
infiltration
with
fibrosis
and
degeneration
of
muscle
fibres
,
consistent
with
focal
myositis
.
No
intervention
was
undertaken
and
one
year
after
presentation
the
tumour
had
regressed
almost
entirely
.
Focal
myositis
can
present
as
a
cervical
tumour
.
On
ultrasound
,
the
condition
is
hard
to
distinguish
from
lymphadenopathy
or
malignancy
.
In
cases
of
insufficient
response
to
empirical
antibiotic
therapy
,
focal
myositis
should
be
considered
.
Diseases
Validation
Diseases presenting
"myositis"
symptom
focal myositis
inclusion body myositis
malignant atrophic papulosis
pyomyositis
systemic capillary leak syndrome
This symptom has already been validated