The vibratory patterns of the 2 vocal folds are asymmetrical, with diminution of vibration near the lesion. Mucosal wave may be present over the polyp itself, depending upon its physical consistency. Vocal fold nodules Vocal fold nodules are bilateral lesions that are roughly symmetrical. The relevant pathology occurs at the basement membrane zone between the overlying epithelium and the underlying lamina propria. The vocal folds have the appearance of medial fullness, typically at the junction of the anterior and middle third of the fold.
Glottic closure is compromised.
Mucosal wave is present bilaterally, though both it and the vibratory amplitude may be decreased. Sulcus vocalis Sulcus vocalis is a focal furrow in the covering of the vocal fold. These lesions most often are unilateral and represent a tethering of the overlying epithelium to the deeper connective tissue. Glottic closure is incomplete. Stroboscopy demonstrates a focal interruption in the mucosal wave at the site of the sulcus, and vibratory patterns are asymmetrical between the true vocal folds.