16,18) A recent analysis of cancers not detected by flexible sigmoidoscopy showed that of the prevalent but not detected lesions, 37% were beyond the reach of the sigmoidoscope
, while 7% were due to inadequate depth of insertion of the sigmoidoscope
; 36% were due to problems in patient compliance, and 21% were due to endoscopist limitation.
Similar to the flexible sigmoidoscope
, the colonoscope is a longer thin black tube that allows the health care professional to examine the entire large intestine.
A conscious effort and manual guidance are necessary for the sigmoidoscope
to enter the diverticulum.
The examination area should have available a range of proctoscopes, rigid sigmoidoscopes
, haemorrhoidal banding, probes, local anaesthetic and instrumentation to allow excision of cutaneous pathology such as perianal haematomas, small skin tags, banding of haemorrhoids, simple haemorrhoidectomy, low fistulotomy, sphincterotomy and excision of anal warts, abscess drainage, etc.
I plan to purchase a video flexible sigmoidoscope
Using a 60 cm flexible sigmoidoscope
, approximately 65%-75% of adenomatous polyps and 40%-65% of colorectal cancers are within its reach, whereas the colonoscope has the ability to view the entire length of the colon (Hawk & Levin, 2005).
One example would be a sigmoidoscope
, which has wire filaments down its length attached to a control knob the doctor can rotate to change the camera's point of view.
Moreover, the excess polyps occurring in smokers tend to be high-grade lesions that occur disproportionately on the left side of the colon, where they are accessible to the flexible sigmoidoscope
Proctoscopy is performed with a shorter instrument than sigmoidoscope
and is not recommended as a colorectal cancer screening test.
A shorter version of the colonoscope is called a sigmoidoscope
The flexible sigmoidoscope
permits fairly complete examination of the colon and increases patient tolerance and comfort.
Because the sigmoidoscope
only visualizes the lower third of the intestine, the entire colon must then be examined with a colonoscope if a polyp is found.