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Sigmoidoscopy

A sigmoidoscopy is a test that provides an inside look at your large intestine. It's a lot like a colonoscopy except it doesn't extend as far into your colon.
Sigmoidoscopy 101
Sigmoidoscopy is an internal examination of the distal large bowel (colon), using an instrument called a sigmoidoscope.
Sigmoidoscopy Diagram
Take a look at where exactly the sigmoidoscope is going when it's in your colon.

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