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Rectal Ultrasound
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.
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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.
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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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