A fairly extensive search through modern literature has given the writer the impression that the sclerotic type of chronic laryngo-trachitis has received very meager attention, and that most text-book sections on the subject are decidedly hazy in tone. It may be simply said that the condition has long been known to laryngologists under various names, but has been much confused with wholly separate pathologic states, and has but rarely been definitely described. A review of the literature of the subject does not therefore seem specially desirable.
Laryngo-tracheal fibrosis may be regarded as the final stage of every case of progressive chronic inflammation of this region—but the element of progression is fortunately absent in the great majority of examples. We know practically nothing of the etiology of sclerosis in this, or indeed in any other region of the body. While the causes of ordinary chronic inflammation may be