Figure 1. Endoscopic views of the lesions lacking detectable
vasculatures
Top left and right images demonstrate a left sided vocal fold granuloma
in spectra B (S-B) and spectra A (S-A) modes, respectively (patient #38
in the survey). The surface of the lesion is covered with a blanket of
fibrin-like material, showing no identifiable vascularization. Bottom
images show S-B and S-A view of a keratotic leukoplakia with low-grade
dysplasia on the left vocal cord (patient #39), vascular patterns are
obscured by the umbrella effect of the plaque.
Figure 2. Longitudinal vascular pattern
Side by side view of W and S-B images of the vocal cords in the patient
#22. Note the meandering tortuous vessels on a polyp on the left vocal
cord (asterisk), and a small polyp with ectatic vessels running parallel
to the right vocal cord (arrows). These changes are classified as
longitudinal.
Figure 3. Perpendicular vascular pattern
Side by side view of W and S-A images of the vocal cords in the patient
#35. The right cord is thick, with an irregular surface, and associated
with subglottic edema; diagnosed as high-grade dysplasia. S-A image
shows perpendicular vessel loops (arrows) as yellow-greyish spots,
indicating the presence of a malignant pathology. On the W image, the
vascular pattern is unclear.