An
ultrasound is an examination using
high-frequency sound waves to create
images of tissue layers beneath
the surface. Ultrasound examination
involves no radiation and is a
very safe procedure. It provides
additional information about rectal
polyps, rectal cancer, perianal
infection, and sphincter muscle
injuries. The examination is performed
by a physician who has special
training in ultrasound exams, and
he will have an assistant who also
has special training for this procedure.
Preparation
For Ultrasound
The
only preparation necessary is an enema
to empty the rectum. You need to arrive
fifteen minutes before the scheduled
appointment to allow time for registration
and to prepare for the exam.
The
Examination
The
doctor and assistant will explain the
exam to you and answer any questions
you have. A nurse will ask about your
medical history and your current medications,
and have you sign a consent form for
the procedure. You will be asked to lie
on your left side. The doctor will begin
by doing a rectal exam. Depending on
the reason for the exam, an instrument
called a proctoscope may be inserted
into the rectum. The ultrasound transducer
is then inserted either through the proctoscope
or by itself. A transducer sends and
receives sound waves that are used to
create images on the screen. An additional
screen is usually available so that you
may watch as the doctor carefully examines
the area.
The
doctor may decide to do a biopsy
(taking small pieces of tissue)
by using a small needle that passes
through the transducer. The doctor
is able to accurately locate and
biopsy any suspicious areas with
the ultrasound transducer. You
may have slight discomfort for
a short time during the biopsy.
Your doctor may take several biopsies
in different areas to ensure an
accurate diagnosis. An antibiotic
is prescribed for 24 hours following
a biopsy.
After
Ultrasound
Your
doctor will explain the findings to you
before you leave. If biopsies were taken,
these will be sent to the laboratory,
and you will be told how to obtain the
results. Doctors involved in your care
will also receive the results.
You
will be given instructions to follow
at home. If you had a biopsy, you
may be given antibiotics. Usually
there are no restrictions on your
activity.
Feel
free to ask questions if something
is not clear to you. Your comments
and input are important to us.
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