<s>
Esophageal	B-Algorithm
dilatation	I-Algorithm
is	O
a	O
therapeutic	O
endoscopic	B-Application
procedure	O
that	O
enlarges	O
the	O
lumen	O
of	O
the	O
esophagus	O
.	O
</s>
<s>
Mercury-weighted	O
bougies	B-Algorithm
are	O
blindly	O
inserted	O
bougies	B-Algorithm
placed	O
into	O
the	O
esophagus	O
by	O
the	O
treating	O
physician	O
.	O
</s>
<s>
Bougie	B-Algorithm
over	O
guidewire	O
dilators	O
are	O
used	O
at	O
the	O
time	O
of	O
gastroscopy	B-Application
or	O
fluoroscopy	O
.	O
</s>
<s>
An	O
endoscopy	B-Application
is	O
usually	O
performed	O
first	O
to	O
evaluate	O
the	O
anatomy	O
,	O
and	O
a	O
guidewire	O
is	O
passed	O
into	O
the	O
stomach	O
past	O
the	O
obstruction	O
.	O
</s>
<s>
Bougies	B-Algorithm
are	O
again	O
introduced	O
—	O
this	O
time	O
over	O
the	O
guidewire	O
—	O
in	O
sequentially	O
increasing	O
sizes	O
.	O
</s>
<s>
Pneumatic	B-Algorithm
dilatation	I-Algorithm
or	O
balloon	O
dilatation	O
is	O
also	O
typically	O
done	O
at	O
the	O
time	O
of	O
endoscopy	B-Application
or	O
fluoroscopy	O
.	O
</s>
<s>
Complications	O
of	O
esophageal	B-Algorithm
dilatation	I-Algorithm
include	O
the	O
following	O
:	O
</s>
