An analysis of the strengths and weaknesses of endoscopic and radiological investigations of velopharyngeal incompetence based on a 20 year experience of simultaneous recording.

The simultaneous recording of nasopharyngoscopy and video fluoroscopy allows a comparison to be made of their reliability under various circumstances. While the monocular view and the number of optical fallacies make measurement from endoscopy impossible, radiological views can also be shown to be fallacious, and all measurements should be treated with caution. However, through clinical observation the variability of the final dimensions of tissues raised to treat velopharyngeal incompetence can be roughly gauged. Indeed, the need for more accurate measurement awaits the arrival of a predictable procedure to allow fine tuning of surgery. Simultaneous recording has permitted improved clarity of interpretation and accuracy of measurement in some cases. The chief gain from investigations over the past 30 years has been in the considerably increased understanding of the range of normal and pathological morphology that must be taken into account in surgical treatment.