<s>
Magnetic	B-Algorithm
resonance	I-Algorithm
myelography	I-Algorithm
(	O
MR	B-Algorithm
myelography	I-Algorithm
or	O
MRI	B-Algorithm
myelography	I-Algorithm
)	O
is	O
a	O
noninvasive	O
medical	B-Application
imaging	I-Application
technique	I-Application
that	O
can	O
provide	O
anatomic	O
information	O
about	O
the	O
subarachnoid	O
space	O
.	O
</s>
<s>
It	O
a	O
is	O
type	O
of	O
MRI	B-Algorithm
examination	O
that	O
uses	O
a	O
contrast	B-Algorithm
medium	I-Algorithm
and	O
magnetic	O
resonance	O
imaging	O
scanner	O
to	O
detect	O
pathology	O
of	O
the	O
spinal	O
cord	O
,	O
including	O
the	O
location	O
of	O
a	O
spinal	O
cord	O
injury	O
,	O
cysts	O
,	O
tumors	O
and	O
other	O
abnormalities	O
.	O
</s>
<s>
The	O
procedure	O
involved	O
the	O
injection	O
of	O
a	O
gadolinium	O
based	O
contrast	B-Algorithm
media	I-Algorithm
into	O
the	O
cervical	O
or	O
lumbar	O
spine	O
,	O
followed	O
by	O
the	O
MRI	B-Algorithm
scan	O
.	O
</s>
<s>
The	O
radiologist	O
will	O
first	O
numb	O
the	O
skin	O
with	O
the	O
local	O
anesthetic	O
and	O
then	O
inject	O
the	O
gadolinium	O
based	O
contrast	B-Algorithm
media	I-Algorithm
into	O
the	O
spinal	O
cord	O
at	O
the	O
interspace	O
between	O
third	O
and	O
fourth	O
lumbar	O
vertebrae	O
(	O
L3-L4	O
)	O
.	O
</s>
<s>
Then	O
the	O
patient	O
will	O
be	O
transferred	O
to	O
the	O
MRI	B-Algorithm
table	O
and	O
the	O
scan	O
will	O
be	O
taken	O
.	O
</s>
<s>
The	O
patient	O
should	O
be	O
observed	O
following	O
the	O
examination	O
for	O
adverse	O
effects	O
of	O
contrast	B-Algorithm
media	I-Algorithm
.	O
</s>
<s>
Nondiagnostic	O
MRI	B-Algorithm
studies	O
of	O
the	O
spine	O
or	O
skull	O
base	O
.	O
</s>
<s>
Poor	O
correlation	O
of	O
physical	O
findings	O
with	O
MRI	B-Algorithm
.	O
</s>
<s>
Major	O
advantages	O
of	O
MR	B-Algorithm
myelography	I-Algorithm
over	O
conventional	O
radiographic	O
myelography	O
include	O
its	O
lack	O
of	O
ionizing	O
radiation	O
,	O
noninvasive	O
nature	O
,	O
and	O
lack	O
of	O
need	O
for	O
intrathecal	O
contrast	B-Algorithm
material	I-Algorithm
.	O
</s>
