It is extremely difficult to prove that in a suspected case of uveal tuberculosis the condition is actually due to the tubercle bacillus. The history of the patient, the appearance of the lesion and the clinical course are all one has to rely on in making a diagnosis of uveal tuberculosis. A focal reaction to tuberculin is generally conceded, in this country, to be too dangerous to justify its use, and even when positive does not afford absolute proof of the nature of the lesion. The patient's cutaneous sensitivity to tuberculoprotein is a diagnostic aid, the significance of which we shall discuss later on. The absence of other possible etiologic factors to explain the lesion is further suggestive evidence. The Schilling differential blood count has been reported by Bredeck1 as of diagnostic value, taken in conjunction with the subcutaneous tuberculin test. Other inflammatory conditions
ADLER FH, MEYER GP. TUBERCULOUS LESIONS OF THE UVEAL TRACT: A REVIEW OF THE LITERATURE. Arch Ophthalmol. 1937;18(2):275–287. doi:10.1001/archopht.1937.00850080099011
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