Figure 1From: Formant analysis in dysphonic patients and automatic Arabic digit speech recognition Left vocal fold cyst. There is a presence of cyst in the left vocal fold. Vocal fold cysts are subepidermal epithelial-lined sacs located within the lamina propria, and may be mucus retention or epidermoid in origin. The voice often sounds diplophonic (particularly with epidermoid cysts), whereby there is great pitch instability.Back to article page