Colonoscopy 9 years ago .marked turtuousity of the sigmoid and a redundant loop , scope could not be passed further. any tec improvements last 9 years?

Virtual colonoscopy: Not that virtual colonoscopy has been embraced as an equal alternative to standard colonoscopy, it is an alternative that may provide meaningful information in your case.

Possibly: Success of colonoscopy often related to degree of sedation for procedure. Also related to experience of colonoscopist . Flexible colonoscope usually employed to go around curves. Noninvasive virtual colonoscopy using ct and MRI but does not allow for therapeutic maneuvers such as polyp/tumour removal or biopsy nor visualization of lesions smaller than 5 millimeters.

Advanced endoscopy: Yes, technology has advanced. Additionally, you should seek out an advanced endoscopist. These gastroenterologists have expertise in performing difficult colonoscopies or other similar procedures.