<s>
A	O
radionuclide	B-Algorithm
cisternogram	I-Algorithm
is	O
a	O
medical	B-Application
imaging	I-Application
study	O
which	O
involves	O
injecting	O
a	O
radionuclide	O
by	O
lumbar	O
puncture	O
(	O
spinal	O
tap	O
)	O
into	O
a	O
patient	O
's	O
cerebral	O
spinal	O
fluid	O
(	O
CSF	O
)	O
to	O
determine	O
if	O
there	O
is	O
abnormal	O
CSF	O
flow	O
within	O
the	O
brain	O
and	O
spinal	O
canal	O
which	O
can	O
be	O
altered	O
by	O
hydrocephalus	O
,	O
Arnold	O
–	O
Chiari	O
malformation	O
,	O
syringomyelia	O
,	O
or	O
an	O
arachnoid	O
cyst	O
.	O
</s>
<s>
The	O
pledgets	O
will	O
be	O
removed	O
and	O
either	O
imaged	O
with	O
a	O
gamma	O
camera	O
or	O
counted	O
using	O
a	O
gamma	B-Algorithm
counter	I-Algorithm
.	O
</s>
<s>
The	O
site	O
of	O
the	O
CSF	O
leak	O
can	O
be	O
plugged	O
with	O
fat	O
or	O
muscle	O
by	O
endoscopic	B-Application
surgery	I-Application
.	O
</s>
