If a mass or any other types of abnormal areas are seen through the flexible sigmoidoscope
or through the colonoscope, a sample will be taken to be examined under the microscope if the tissue is cancerous or benign.
To determine the frequency of cancerous and precancerous lesions in persons with no bowel disease symptoms, the Indiana University Medical Center in Indianapolis is conducting an extensive study on volunteers in the 50- to 75-year age range who are undergoing colonoscopy, a procedure that employs a state-of-the-art instrument known as the flexible sigmoidoscope
. Almost three times the length of the rigid sigmoidoscope, the flexible sigmoidoscope
can be passed through the entire length of the large bowel, enabling both the operator and the patient to view every square inch of one's colon in glorious living color through a tiny TV camera in its tip.
A 60-cm flexible sigmoidoscope
was used with an average insertion depth of 50 cm.
([Subsection])Race characteristics from the US Department of Commerce, Bureau of Census, 1983.(26) Using a 60-cm flexible sigmoidoscope
, lesions were found in 36 (3.6%) patients.
(22,27,42-44) Because of the variability of the distance of insertion for the 60-cm flexible sigmoidoscope
, (27,45) two definitions of cancer within reach of the sigmoidoscope were used: (1) All incident cases of colorectal cancer with subsite specified distal to the splenic flexure (ICD 153.2, 153.3, 154.0, and 154.1) plus one half of the cases classified as splenic flexure (153.7) were taken as the maximum amount of colorectal cancer that could reasonably be detected by the instrument (MAX).
These comprise 52 gastroscopes, 24 colonoscopes, 10 duodenoscopes and 3 flexible sigmoidoscopes
. The average age of the endoscopes is 6.1 years (range 1-23 years); 15 are 15 years old or older (Fig.
Comparison of video and non-video flexible sigmoidoscopes
for training of medical resident [abstract].