One hundred and eighty-four cases of vocal
polyps and 64 cases of vocal nodules are reported. Of these cases, 6
polyps and 10 nodules had been studied with electron microscope: 40 cases of
polyps and 15 cases of nodules were investigated histo-chemically with PAS, AB-PAS,
HID-AB,
Congo Red and other methods. It seems that
polyps are distinctly different from nodules. They are different diseases. The main difference between them is that
polyp of the vocal cord is caused primarily by circulation impediment,
thrombosis, exudation and
edema of the lamina propria of the mucous membrane due to
inflammation, there is secondary
atrophy of the epithelium of the cord, vocal nodule is caused primarily by vocal abuse, this leads to friction or dash of the vocal cords against each other, there is circumscribed
hyperplasia or hyperkeratinization and secondary hyaline-degeneration in lamina propria of the cord. The differential diagnosis, pathogenesis and treatment had been discussed.