The prognosis in tuberculosis of the larynx has decidedly improved since Sir Morrell Mackenzie1 in 1880 made the statement so often quoted that "the prognosis of laryngeal tuberculosis is always extremely unfavorable and it is not certain that any cases ever recover." Search of the French and German literature of that era revealed the prognosis to be equally hopeless. Sir St. Clair Thomson2 in 1924 said: "A Group I patient (that is a slight case) with a laryngeal lesion has a worse prospect than a Group II case with a sound larynx. And a Group II case (that is a severe case) with throat trouble has a gloomier expectation than if he had a healthy larynx, but lungs so involved as to be classed in Group III (that is an 'advanced' case). Differently expressed, the discovery of a laryngeal lesion at once moves a case down to a lower group."
GREENE JB. PROGNOSIS IN LARYNGEAL TUBERCULOSIS. Arch Otolaryngol. 1937;26(1):18–28. doi:10.1001/archotol.1937.00650020024003
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