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Velopharyngeal insufficiency is the improper closing of the velopharyngeal sphincter (soft palate muscle) during speech
Velopharyngeal insufficiency is treated with a combination of surgery and speech therapy.
The combination of surgery to correct the insufficiency and speech therapy to retrain the voice successfully alleviate velopharyngeal insufficiency.
Charles R. Eisenbach has written:
'Surgically correcting velopharyngeal insufficiency' -- subject(s): Velopharyngeal insufficiency, Surgery
The correct spelling is velopharyngeal insufficiency.