Figure Legends
Figure 1(A) Axial Non-Contrast CT examination of the neck at the level of the larynx demonstrates a well-defined polypoid soft tissue mass arising from the anterior commissure. Axial (B) and sagittal (C) contrast-enhanced CT examination of the neck demonstrate partial enhancement. . Intraoperative direct laryngoscopy (D) showing the 1.5cm mass attached to the anterior commissure.
Figure 2 (A) Exophytic proliferation of spindle cells in a loose myxoid background (H&E, 40 X). (B) Spindle cells admixed with chronic inflammatory cells in a myxoid background (H&E, 200X). (C) Tumor cells have low nuclear cytoplasmic ratios, hypochromatic nuclei with open chromatin and prominent nucleoli. Mitotic figures are present (H&E, 400X). (D) Tumor cells show positive staining for ALK-1 by immunohistochemistry (ALK-1, 200X).