Abstract
The authors report three cases, young male, of hyperkeratosis of the pharynx, and a case, 77 year old male, of hyperkeratosis of the larynx. The former three cases were performed tonsillectomy on both sides, and completely healed. In the removed tonsils remarkable epithelial hyper_ keratosis and the tissue of bone and cartilage were observable. The authors concluded from the histologic figures that they were caused by inflammatory metaplasia.
In the larynx of the latter case was observable a grayish white mass of hyperkeratosis with a namber of tiny, white, spiny substances as scen in the cases of hyperkeratosis of the pharynx. A marked effect was obtained by X-ray irradiation.
It was histologically parakeratosis, and no malignant change even was revealed by a repeated biopsy.
